The ratio of third proportional to 12 and 30 and the mean proportional between 9 and 25 is: 12 और 30 के तीसरे समानुपाती और 9 और 25 के मध्यानुपाती का अनुपात क्या है?
A
2:1 (2:1)
B
5:1 (5:1)
C
7:15 (7:15)
D
9:14 (9:14)
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Correct Answer 5:1
Explanation
Third proportional to 12, 30 = $(30^2)/12 = 900/12 = 75$. Mean proportional to 9, 25 = $sqrt{9*25} = 3*5 = 15$. Ratio = 75:15 = 5:1.