Question

The first three terms of a proportion are 3,9,12.the fourth
term is ​

Answer 1

Step-by-step explanation:

the ans is given above.

Answer 2

Given:

We have given three numbers 3,9,12.

To Find:

We have to find the fourth number which is in proportion?

Step-by-step explanation:

Proportion:

• Two ratios are said to be in proportion when they are in equivalent ratio.
• If the set of numbers is in proportion then the product of extreme terms must be equal to the product of mean terms.
• Let the fourth number be x. Then we can write it as

         3:9::12:x

• Now the product of extreme terms which are 3 and x must be equal to the product of mean terms which are 12 and 9.

        $3\times x=9\times12$

• Noe simplify the above equation by taking all the terms one side we get

       $x=\frac{9\times12}{3} \\x=36$

Hence, the fourth number is 36.