Finding the Fourth Proportional to 79.12, 117.74 and 74.02
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Solution
The fourth proportional to 79.12, 117.74 and 74.02 is: 110.15
Step by Step Solution
- Step 1: Write the proportion equation
79.12 : 117.74 = 74.02 : x - Step 2: Convert to fraction form
79.12/117.74 = 74.02/x - Step 3: Cross multiply
79.12x = 117.74 × 74.02 - Step 4: Simplify right side
79.12x = 8,715.11 - Step 5: Solve for x
x = 8,715.11/79.12 - Step 6: Final answer
x = 110.15
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These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.