28/48 as a percentage is 58.33%. This is the rounded value you get when you change the fraction to a percent. It tells you that the fraction is just over half of a whole.
The fraction 28/48 can be reduced to 7/12, which still represents the same part of a whole. Whether you write it as a fraction or a percent, the size of the portion doesn’t change—it’s still the same amount.
Knowing the percent makes it easy to compare this portion to other values, like grades, discounts, or test scores. When you see 58.33%, you instantly understand it’s a little more than fifty percent.