The time signature with three quarter note beats per measure is called

The two numbers in the time signature tell you how many beats are in each measure of music. A piece with a time signature of 4/4 has four quarter note beats; each measure with a 3/4 meter has three quarter note beats; and each measure of 2/4 time has two quarter note beats ... It means each measure has only four beats. (i copied and pasted from google just FYI)

The time signature formula with three quarter note beats per measure is called 3/4 of time

Explanation:

The compass has the function of defining the unit of time, the rhythm and the pulse of the composition of a song. They are represented in the score by vertical lines on the staff. The measure is represented by a fraction, the number of the denominator will indicate in how many parts a quarter note must be divided to obtain a unit of duration. And the number above refers to the units of time. Each bar can combine notes and pauses in a particular way, but the sum of these can not exceed or be less than the indicated unit of time.

With this, we can conclude that the time signature with three quarter note beats per measure is called 3/4 of time.