The ratio of the third proportional of P and Q and the fourth proportional of P, Q, and R is 5 : 6, then Q : R is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 5 : 6.
Calculations:
The third proportion of P and Q is Q2/P
And the fourth proportion of P, Q, and R is (Q × R)/P
According to the question;
⇒ (Q2/P)/(Q × R)/P = 5/6
⇒ Q/R = 5/6
Hence, the required ratio is 5 : 6.