72/86 as a percentage is 83.72%. This is the rounded value you get when you express the fraction in terms of hundredths, and it gives a quick sense of how large the fraction is compared to a whole.
The fraction 72/86 can be reduced a little, but even in its original form it already shows that the numerator is close to the denominator. That closeness is why the percentage is well above 80%, indicating the fraction represents a large part of the whole.
In everyday situations, saying something is 83.72% complete or successful is clearer than using the raw fraction. Whether you’re tracking progress, grading work, or measuring a mixture, the percentage makes the information easy to understand at a glance.