When close to half the companies in the United States have price-to-earnings ratios (or "P/E's") below 18x, you may consider Cisco Systems, Inc. (NASDAQ:CSCO) as a stock to potentially avoid with its 20.7x P/E ratio. However, the P/E might be high for a reason and it requires further investigation to determine if it's justified.

Recent times haven't been advantageous for Cisco Systems as its earnings have been falling quicker than most other companies. One possibility is that the P/E is high because investors think the company will turn things around completely and accelerate past most others in the market. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Want the full picture on analyst estimates for the company? Then our free report on Cisco Systems will help you uncover what's on the horizon.

How Is Cisco Systems' Growth Trending?

There's an inherent assumption that a company should outperform the market for P/E ratios like Cisco Systems' to be considered reasonable.

Retrospectively, the last year delivered a frustrating 17% decrease to the company's bottom line. Unfortunately, that's brought it right back to where it started three years ago with EPS growth being virtually non-existent overall during that time. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Shifting to the future, estimates from the analysts covering the company suggest earnings should grow by 7.2% each year over the next three years. Meanwhile, the rest of the market is forecast to expand by 10% each year, which is noticeably more attractive.

With this information, we find it concerning that Cisco Systems is trading at a P/E higher than the market. Apparently many investors in the company are way more bullish than analysts indicate and aren't willing to let go of their stock at any price. Only the boldest would assume these prices are sustainable as this level of earnings growth is likely to weigh heavily on the share price eventually.

The Final Word

Typically, we'd caution against reading too much into price-to-earnings ratios when settling on investment decisions, though it can reveal plenty about what other market participants think about the company.

Our examination of Cisco Systems' analyst forecasts revealed that its inferior earnings outlook isn't impacting its high P/E anywhere near as much as we would have predicted. Right now we are increasingly uncomfortable with the high P/E as the predicted future earnings aren't likely to support such positive sentiment for long. Unless these conditions improve markedly, it's very challenging to accept these prices as being reasonable.

Many other vital risk factors can be found on the company's balance sheet. Take a look at our free balance sheet analysis for Cisco Systems with six simple checks on some of these key factors.

Of course, you might also be able to find a better stock than Cisco Systems. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.