Question

what is the third propotional of 12and 18​

Answer 1

The third proportion to a and b is defined as the number x such that a,b,x are in a geometric progression.”

Now, here a=12,b=18 and ‘c’ is to be found.

So,

1218=18c

c=18×1812

So, c=27

Therefore option (c) is correct.

Hope it helped!!!… :)

Answer 2

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The third proportion of two numbers, x and y,is z,such that x:y=y:z or x:y::y:z

We need to find out 3rd proportion of 12 and 18

12:18=18:t

since a:b=c:d

ad=bc

So,

18^2=12t

t=324/12

t=27

Hence, the third proportion of 12 and 28 is 27