Question

Find the unknown value in the proportion: 4:×=9:18
subject Maths.​

Answer 1

Answer:

Step-by-step explanation:

4÷  =  9 ÷

x 18

Cross multiply:

4 * 18 = x * 9

Simplifying

4 * 18 = x * 9

Multiply 4 * 18

72 = x * 9

Reorder the terms for easier multiplication:

72 = 9x

Solving

72 = 9x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-9x' to each side of the equation.

72 + -9x = 9x + -9x

Combine like terms: 9x + -9x = 0

72 + -9x = 0

Add '-72' to each side of the equation.

72 + -72 + -9x = 0 + -72

Combine like terms: 72 + -72 = 0

0 + -9x = 0 + -72

-9x = 0 + -72

Combine like terms: 0 + -72 = -72

-9x = -72

Divide each side by '-9'.

x = 8

Simplifying

x = 8