76/88 as a percentage is 86.36%. This rounded figure gives a quick sense of how large the fraction is compared to a whole.
The fraction 76/88 can be reduced to 19/22, which still represents the same value. Seeing it as a percentage makes it easier to compare with other numbers that are already expressed in percent form.
In everyday situations, you might use this percentage when looking at scores, success rates, or any scenario where a part of a whole is needed in a more familiar format. It tells you that the fraction is just a little under 90 % of the total.