I am trying to find the perimeter of a Rectangle,

However I think I am doing something wrong.

The length of a rectangle is four times its width. If the area of the rectangle is 144in^2, find its perimeter.

Ok, so first things first, I find that L=4W

2L+2w=144in^2

144*144=20736 in or 1728 ft

2(4w)+2w=1728ft

8W+2W=1728ft

10w=1728ft

/10 /10

w=172.8ft

Did I do this correctly?