Aptitude Day 89

Ratio and Proportion:

1. The ratio of third proportional to 10 and 20 and the mean proportional between 49 and 64 is:

Solution:

                Let the third proportional be x.

                10:20::20:x

                4x= 20*20

                x= 40.

               The mean proportional between 49 and 64 is (49*64)^1/2 = 7*8 = 56.

               The ratio between them is 40: 56

                                                                5: 7

      

2. In a ratio, which is equal to 4:9, if the antecedent is 16, then the consequent is:

Solution:

                Let the consequent be x.

                4/9  = 16/x

                x = (16*9)/4

                x = 36.