The ratio of third proportional to 12 and 30 and the mean proportional between 9 and 25 is:

Options
- 2:3
- 3:1
- 4:5
- 5:1

CORRECT ANSWER : 5:1

Discussion Board
Maths

If x:y=7:5,then the value of(5x-2y):(3x+2y) is

Bandana 10-30-2022 03:52 AM

THANKS!

THANK YOU FOR THE SOLUTION MAN! IT WAS DAMN TOUGH TO CRACK IT! ??

LudoKhelKeDikhaLodu 03-26-2022 04:17 AM

Maths

Third proportion: p:q=q:s
12:30=30:s
12/30=30/s
12s=900; s=75
Mean proportion=v25×9= 15
75:15=5:1

Akhila 12-12-2021 09:23 AM

math

can''t understand

jay 11-19-2021 10:24 AM

solution

Let the third proportional to 12 and 30 be x.

Then, 12 : 30 :: 30 : x <=> 12x = 30 x 30 <=> x = (30*30\12)
= 75.





Third proportional to 12 and 30 = 75.

Mean proportional between 9 and 25 = sqrt(9)*sqrt(25)
= 15.

Required ratio = 75 : 15 = 5 : 1.

deepak soni 10-5-2018 01:38 AM

HI

SIR PLEASE PROVIDE DETAILED SOLUTION

MOHANKRISHNA B 12-8-2016 12:37 PM

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