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Finding the Fourth Proportional to 87,861.20, 131,791.80 and 86,694.80

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Solution

The fourth proportional to 87,861.20, 131,791.80 and 86,694.80 is: 130,042.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,861.20 : 131,791.80 = 86,694.80 : x
  2. Step 2: Convert to fraction form
    87,861.20/131,791.80 = 86,694.80/x
  3. Step 3: Cross multiply
    87,861.20x = 131,791.80 × 86,694.80
  4. Step 4: Simplify right side
    87,861.20x = 11,425,663,742.64
  5. Step 5: Solve for x
    x = 11,425,663,742.64/87,861.20
  6. Step 6: Final answer
    x = 130,042.20

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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.