Question

Find the third proportional of 16 and 20.​

Answer 1

ᴛᴏ ғɪɴᴅ :

• the third proportional of 16 and 20

sᴏʟᴜᴛɪᴏɴ :

Let the third proportional of 16 and 20 be x.

Then 16, 20, x are in proportion.

This means 16 : 20 = 20 : x

So, 16 × x = 20 × 20

x = $\sf{\frac{(20 × 20)}{16}}$

x = $\sf{\frac{400}{16}}$

x = 25

Therefore, the third proportional of 16 and 20 is 25.