Question

find missing number 120 : 80 proportion 90:_​

Answer 1

we know that the product of extreme is equal to product of mean

Therefore 120:80::90:X = 120*X = 80*90

= 120X = 80*90

X = 90*80/120

X= 90*8/12

X = 90/3

X = 30

$...$

Answer 2

Answer:

x= 30

Step-by-step explanation:

we know that the product of extreme is equal to product of mean

Therefore 120:80::90:X = 120*X = 80*90

= 120X = 80*90

X = 90*80/120

X= 90*8/12

X = 90/3

X = 30