Two numbers are in the ratio of 4:9 Mean proportional between them is 24 Formula used: If a and b are two numbers, then mean proportional =√(a×b) Calculation: Let the two numbers be 4 x and 9 x Mean proportional =√(4x×9x) ⇒24=√(36x2) ⇒24=6x ⇒x=4 First number =4x=4×4=16 Second number =9x=9×4=36 Positive difference =36−16=20