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Finding the Fourth Proportional to 87,387, 131,080.98 and 21,723

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Solution

The fourth proportional to 87,387, 131,080.98 and 21,723 is: 32,584.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,387 : 131,080.98 = 21,723 : x
  2. Step 2: Convert to fraction form
    87,387/131,080.98 = 21,723/x
  3. Step 3: Cross multiply
    87,387x = 131,080.98 × 21,723
  4. Step 4: Simplify right side
    87,387x = 2,847,472,128.54
  5. Step 5: Solve for x
    x = 2,847,472,128.54/87,387
  6. Step 6: Final answer
    x = 32,584.62

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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.