Question

the ratio of the areas of two rectangles is 4 to 5. if the area of the larger rectangle is 135 square feet, what is the area of the smaller rectangle? Set up a proportion and solve.

Answer 1

Divide the number 135 and 5. It is going to be 27. Then you multiply 27 times 4. Then you get your answer which is 108.
Proportion set up....
small    4                    ?          small
           -----             --------
big         5                    135         big         
Cross multiply 4x135= 540
and then divide 540/5= 108