The ratio of the third proportional to 16 & 40 and the mean proportional between 10 & 40 is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 5 : 1.
According to the question;
The third proportional to 16 & 40 = 1600/16 = 100
The mean proportional between 10 & 40 = √400 = 20
Hence, the required ratio = 100 : 20 = 5 : 1