Answer
$w=\frac{4}{3}h$
Work Step by Step
Let the dimensions of the screen be:
$w =$ width
$h=$ height
The ration is $w : h=4:3$
$\rightarrow \frac{w}{h}=\frac{4}{3}$
$\rightarrow w=\frac{4}{3}h$
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