Finding the Fourth Proportional to 85,469,178.20, 128,203,767.30 and 76,959,123.80
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Solution
The fourth proportional to 85,469,178.20, 128,203,767.30 and 76,959,123.80 is: 115,438,685.70
Step by Step Solution
- Step 1: Write the proportion equation
85,469,178.20 : 128,203,767.30 = 76,959,123.80 : x - Step 2: Convert to fraction form
85,469,178.20/128,203,767.30 = 76,959,123.80/x - Step 3: Cross multiply
85,469,178.20x = 128,203,767.30 × 76,959,123.80 - Step 4: Simplify right side
85,469,178.20x = 9,866,449,599,267,092 - Step 5: Solve for x
x = 9,866,449,599,267,092/85,469,178.20 - Step 6: Final answer
x = 115,438,685.70
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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.