Question

find the third proportion of of 5 and 15

Answer 1

hey here is your answer

THIRD PROPORTION

5:15:15:x

Soo
5*x=15*15
5x=225
x=45

so it's third proportion is 45

HOPE YOU UNDERSTAND

MARK BRILLIANT

Answer 2

The third proportional of two numbers a and b is defined to be that number c such that a : b = b : c.

So you want to find a number c such that 5 : 15 = 15 : c.

=5:15::15:c

=5×c=15×15

5c=15×15

c=15×15/5

c=45 ans...