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