When you convert 54/77 to a percentage, you get 70.13%. That is the rounded value you would see on a calculator or in a report.
The fraction 54/77 is a bit more than half, which is why its percentage is a little above 50 %. It can be useful when comparing parts of a whole, such as scores, grades, or parts of a budget.
Knowing the percentage helps you understand the size of the fraction in everyday terms. You can quickly say that 54 out of 77 items represent about seventy percent of the total.