Which least number must be subtracted from each of the term 14, 36, 20, 54 to make them proportional?

3

To make these numbers in proportion, the condition should be:

(14 - a) : (36 - a) :: (20 - a) : (54 - a)

Check from the option, which is the best way to find the number.

So, Option (a):- 3 will justify the equation.

(14 - 3) : (36 - 3) :: (20 - 3) : (54 - 3)

    11    :      33    ::     17    :     51

     1     :       3    ::       1    :      3

Therefore, 3 is correct answer.