Question

Find the third proportional to: 5:7​

Answer 1

Answer:

Let the third proportional be x

then,

21/4 × x = 7×7

x= 49×4÷21

x= 28/3

x= 9 1/3

Step-by-step explanation:

Formula of third proportion

We can write it as a:b = c:d. The quantity c is known as third proportional to the quantities a, b, and d. For example, if we write the quantities 7,8,9, and 10 in the proportional form 7:8 :: 9:10, then 9 is the third proportional to 7, 8, and 10.

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