Find the third proportional to 9 and 12

Let the third proportional to 9 and 12 be x.

Then the fourth propotionalto 9,12,12 is x.

therefore,9:12::12:x

9*x=12*12

x=(12*12)/9=16

Find the third proportional to 9 and 12

Let the third proportional to 9 and 12 be x.

Then the fourth propotionalto 9,12,12 is x.

therefore,9:12::12:x

9*x=12*12

x=(12*12)/9=16

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