34/84 as a percentage is 40.48%. This rounded figure shows how much of a whole the fraction represents when expressed in percent form.
The fraction 34/84 can be simplified to 17/42, which still keeps the same value. It’s a common way to compare parts of a set, like a small group out of a larger class.
Knowing the percentage helps you quickly see the size of the part. Whether you’re looking at survey results, grades, or any data, 40.48% tells you that roughly four out of every ten pieces belong to the group represented by 34 out of 84.