To find a rational number with one decimal place that is between √17 and √18, we can approximate these irrational numbers to one decimal place.
The square root of 17 is approximately 4.1 (since 4.123105625617661 is rounded to 4.1).
The square root of 18 is approximately 4.2 (since 4.242640687119285 is rounded to 4.2).
So, we are looking for a rational number between 4.1 and 4.2. One such number is 4.15, which is between 4.1 and 4.2.
Therefore, a rational number with one decimal place that is between √17 and √18 is 4.15.