72/86 as a percentage is 83.72%. This value tells you how much of a whole the fraction represents when you look at it in terms of hundredths.
The fraction 72/86 can be simplified to a decimal, which then becomes the percentage you see above. Seeing it as 83.72% makes it easier to compare with other numbers that are already expressed as percentages, such as test scores or interest rates.
In everyday use, you might round the number to 84% for quick estimates, but the precise rounded figure of 83.72% gives a more accurate picture whenever exactness matters.