Can someone help me set it up im very confused.

I won't give you the answer unless you request it.

Step-by-step explanation:

Since an aspect ratio is width : height, and the aspect ratio of a television is 4:3, the width is 4/3 as big as the height. We can think of the width as 4x and the height as 3x. (x is the scale)

Since we know the width is 46, we can plug in 46 for 4x.. so 3x is..

so, converting firstly the mixed fractions to improper fractions and then "adding".