75.36% is the percentage equivalent of the fraction 52/69. This value tells you how much of a whole 52 parts out of 69 represent when you think of it in terms of 100.
The fraction 52/69 cannot be reduced further because 52 and 69 share no common factors other than 1. It is a little more than three‑quarters of a whole, which is why its percentage is close to 75%.
When you see 75.36% in a report or a chart, you can understand it as a fairly high proportion—just a bit higher than three‑quarters. It’s a useful way to compare that part of a whole with other percentages that might be shown alongside it.