Finding the Fourth Proportional to 71,987,872.60, 107,981,808.90 and 66,445,139.80
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Solution
The fourth proportional to 71,987,872.60, 107,981,808.90 and 66,445,139.80 is: 99,667,709.70
Step by Step Solution
- Step 1: Write the proportion equation
71,987,872.60 : 107,981,808.90 = 66,445,139.80 : x - Step 2: Convert to fraction form
71,987,872.60/107,981,808.90 = 66,445,139.80/x - Step 3: Cross multiply
71,987,872.60x = 107,981,808.90 × 66,445,139.80 - Step 4: Simplify right side
71,987,872.60x = 7,174,866,388,217,384 - Step 5: Solve for x
x = 7,174,866,388,217,384/71,987,872.60 - Step 6: Final answer
x = 99,667,709.70
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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.