The fraction 37/43 works out to about 86.05% when you turn it into a percentage. This tells you that the part represented by 37 is a little more than four‑fifths of the whole 43.
Seeing the number as a percent makes it easy to compare with other values. For example, if you scored 86.05% on a test, you’d be just a bit short of a perfect score. It also shows that the fraction is fairly large, since it’s close to 100%.
In everyday use, you might round the percent to 86% for quick estimates, but the exact rounded value to two decimals is 86.05%. This gives a clear picture of how big the part is compared to the whole.