When you turn 74/78 into a percent you get 94.87%. This means the fraction is just a little under one whole, so it’s pretty close to 100 %.
The fraction 74/78 can be simplified by dividing both numbers by 2, giving 37/39. Even in this reduced form it’s still a large portion of the whole, which is why the percentage is so high.
Seeing the number as a percentage makes it easier to compare with other values. For example, if you scored 74 out of 78 points on a test, you’d have earned about 94.87 % of the possible points.
In everyday situations we often round this kind of result to a whole number, saying you got roughly 95 %. But the exact rounded value to two decimal places stays 94.87%.