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Finding the Fourth Proportional to 391,312.80, 587,232.24 and 138,592.38

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Solution

The fourth proportional to 391,312.80, 587,232.24 and 138,592.38 is: 207,981.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,312.80 : 587,232.24 = 138,592.38 : x
  2. Step 2: Convert to fraction form
    391,312.80/587,232.24 = 138,592.38/x
  3. Step 3: Cross multiply
    391,312.80x = 587,232.24 × 138,592.38
  4. Step 4: Simplify right side
    391,312.80x = 81,385,913,754.33
  5. Step 5: Solve for x
    x = 81,385,913,754.33/391,312.80
  6. Step 6: Final answer
    x = 207,981.73

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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.