To find a rational number with one decimal place that is between \(\sqrt{17}\) and \(\sqrt{18}\), we first need to approximate the values of \(\sqrt{17}\) and \(\sqrt{18}\).
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Calculate \(\sqrt{17}\): \[ \sqrt{17} \approx 4.123 (more precisely, it's around 4.1231) \]
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Calculate \(\sqrt{18}\): \[ \sqrt{18} \approx 4.243 (more precisely, it's around 4.2426) \]
Now we need to find a rational number with one decimal place that lies between these two approximations.
A decimal that fits this criterion is \(4.2\), as \(4.2\) is greater than \(4.123\) and less than \(4.243\).
Thus, a rational number with one decimal place between \(\sqrt{17}\) and \(\sqrt{18}\) is \(\boxed{4.2}\).