5 answers
(click or scroll down)
Since 12:9 is equivalent to 4:x, we can set up a proportion to solve for x:
12/9 = 4/x
Cross multiply:
12x = 9 * 4
12x = 36
Divide by 12:
x = 36 / 12
x = 3
Therefore, the equivalent ratio of 12:9 as a ratio of 4:x is 4:3.