Finding the Fourth Proportional to 129,306.38, 178,442.80 and 72,717.75
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Solution
The fourth proportional to 129,306.38, 178,442.80 and 72,717.75 is: 100,350.50
Step by Step Solution
- Step 1: Write the proportion equation
129,306.38 : 178,442.80 = 72,717.75 : x - Step 2: Convert to fraction form
129,306.38/178,442.80 = 72,717.75/x - Step 3: Cross multiply
129,306.38x = 178,442.80 × 72,717.75 - Step 4: Simplify right side
129,306.38x = 12,975,958,737.91 - Step 5: Solve for x
x = 12,975,958,737.91/129,306.38 - Step 6: Final answer
x = 100,350.50
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.