Finding the Fourth Proportional to 128,432.31, 177,226.97 and 71,832.75
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Solution
The fourth proportional to 128,432.31, 177,226.97 and 71,832.75 is: 99,123.81
Step by Step Solution
- Step 1: Write the proportion equation
128,432.31 : 177,226.97 = 71,832.75 : x - Step 2: Convert to fraction form
128,432.31/177,226.97 = 71,832.75/x - Step 3: Cross multiply
128,432.31x = 177,226.97 × 71,832.75 - Step 4: Simplify right side
128,432.31x = 12,730,700,270.10 - Step 5: Solve for x
x = 12,730,700,270.10/128,432.31 - Step 6: Final answer
x = 99,123.81
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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.