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Finding the Fourth Proportional to 391,319.54, 587,242.35 and 138,599.13

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Solution

The fourth proportional to 391,319.54, 587,242.35 and 138,599.13 is: 207,991.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,319.54 : 587,242.35 = 138,599.13 : x
  2. Step 2: Convert to fraction form
    391,319.54/587,242.35 = 138,599.13/x
  3. Step 3: Cross multiply
    391,319.54x = 587,242.35 × 138,599.13
  4. Step 4: Simplify right side
    391,319.54x = 81,391,278,809.16
  5. Step 5: Solve for x
    x = 81,391,278,809.16/391,319.54
  6. Step 6: Final answer
    x = 207,991.86

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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.