4/4 would equal 160.

Use proportions to solve this answer, like John McCann did above.

(3/4)/120 = (4/4)/x

We use x because 4/4 isn't given a number, while 3/4 is.

(3/4)/120 = 1/x

3/4 = 120 * (1/x)

3/4 = 120/x

(3/4) * x = (120/x) * x

3x/4 = 120

(3x/4) * 4 = 120 * 4

3x = 480

3x/3 = 480/3

**x = 160** <--- 4/4 would equal to 160 is 3/4 was equal to 120.