When you turn 24/52 into a percent you get 46.15%. This number shows the same size as the original fraction, just in a format that's easy to compare with other percentages.
The fraction 24/52 can be reduced to a simpler form, which still represents the same part of a whole. Even after simplifying, the proportion stays the same, so the percentage stays at 46.15%.
In everyday situations, 46.15% might describe a test score, a portion of a budget, or the amount of a class that completed a project. Knowing the percentage helps you quickly see how big or small the part is compared to the whole.
Overall, 24/52 and 46.15% are just two ways of writing the same value, useful in different contexts.