34/55 as a percentage is 61.82%. This rounded value gives a quick sense of how large the fraction is compared to a whole.
The fraction 34/55 can be thought of as 34 parts out of 55 equal parts. When you picture it, a little more than half of the whole is covered, which matches the percentage we just saw.
In everyday situations, you might see this percentage on a report card, a discount, or a sports statistic. Knowing the rounded 61.82% helps you compare it easily with other numbers without having to work with the fraction directly.