The aspect ratio for a laptop computer monitor is 5 to 4. The screen has a perimeter of 32.4 inches. What is the diagonal measure of the screen?

Question

 You can round the answer to the nearest tenth of an inch. 

Answer 1

aspect ratio is 5 to 4

5x+5x+4x+4x=32.4

18x=32.4

x=32.4/18

x=1.8

4*1.8=7.2 inches wide

5*1.8=9 inches long

using the Pythagorean Theorem...

9²+7.2²=n² where n=diagonal

81+51.84=n²

132.84=n²

take the square root of both sides

n=√132.84

n=11.52562

n=11.5 inches rounded off