Question

7. Find the third proportional to 4 and 12.​

Answer 1

let third proportional = a

therefore,

4 /12 = 12/a

thus,

4a = 144

=> a = 36

Answer 2

Step-by-step explanation:

Let a=4, b=12 and c is the required 3rd propotional.

since, we know that third propotional of two numbers a,b is defined as,

a:b=b:c

so now,

4:12 = 12:c

4/12 = 12/c

4×c = 12 × 12

4c = 144

c = 36

Hence, third propotional= 36

so your answer is 36

Hope it is helpful to you