76/84 as a percentage is 90.48%. This means that the fraction is almost a full whole, just a little under 100 %.
The fraction 76/84 can also be reduced to 19/21, which shows the same proportion in a simpler form. Both versions represent the same amount, so you can use either one depending on what looks clearer in your work.
When you see 90.48% on a chart or in a report, you know it’s the same value as 76 out of 84 parts. It’s a handy way to compare that portion to other percentages without having to think about the original numbers.