Finding the Fourth Proportional to 138,631.70, 207,947.55 and 76,423.70
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Solution
The fourth proportional to 138,631.70, 207,947.55 and 76,423.70 is: 114,635.55
Step by Step Solution
- Step 1: Write the proportion equation
138,631.70 : 207,947.55 = 76,423.70 : x - Step 2: Convert to fraction form
138,631.70/207,947.55 = 76,423.70/x - Step 3: Cross multiply
138,631.70x = 207,947.55 × 76,423.70 - Step 4: Simplify right side
138,631.70x = 15,892,121,176.94 - Step 5: Solve for x
x = 15,892,121,176.94/138,631.70 - Step 6: Final answer
x = 114,635.55
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.