Question

the third proportional to 8 and 12 is

Answer 1

hii

The third proportional of two numbers a and b is defined to be that number c such that  a : b = b : c.

So you want to find a number c such that 8 : 12 = 12 : c.  That number is 18

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Answer 2

let the third proportion be x.

then 8,12 and x are in proportion

then 8:12=12:x

8x=12×12

x=144/8=18

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