4/82 as a percentage is 4.88%. This rounded figure tells you how much of a whole the fraction represents when you look at it in terms of hundredths.
The fraction 4/82 can be simplified to 2/41, which is still a small part of a whole. It shows up in everyday situations, like when you have 4 out of 82 items in a collection or 4 successes out of 82 attempts.
Knowing the percentage makes it easier to compare this amount with other values. For example, 4.88% is less than 5%, so you can quickly see it’s a tiny share of the total.