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Question:

Calculate the value of x:
30 : 45 = 18 : x

A x = 27
Explaination

To find the unknown value in a ratio, we rewrite the ratios as fractions and use some conversions or cross-multiply.
Step 1: Rewrite the ratios as fractions
30:45 = 18:x is equivalent to (30/45) = (18/x)
Step 2: Cross-multiply the fractions
30 × x = 18 × 45
30x = 810
Step 3: Divide both of the sides by 30 to get x
(30x/30) = (810/30)
810 ÷ 30 = 27
x = 27