Question

find third proportinal to 12and30​

Answer 1

Answer:

18

Step-by-step explanation:

its correct answer

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Answer 2

Step-by-step explanation:

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.