When you convert 27/74 to a percentage you get 36.49%. This number tells you how many parts out of a hundred the fraction represents, rounded to two decimal places.
The fraction 27/74 is a proper fraction, meaning the numerator (27) is smaller than the denominator (74). It represents a little more than one third of a whole, which is why its percentage is well under 50 %.
Knowing the percentage can be handy for quick comparisons. For example, if you see a discount of 36.49 % on a product, you can instantly understand that the price is being reduced by roughly a third. This makes the fraction easier to work with in everyday situations.