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Finding the Fourth Proportional to 391,809.80, 587,714.70 and 372,456.20

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Solution

The fourth proportional to 391,809.80, 587,714.70 and 372,456.20 is: 558,684.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,809.80 : 587,714.70 = 372,456.20 : x
  2. Step 2: Convert to fraction form
    391,809.80/587,714.70 = 372,456.20/x
  3. Step 3: Cross multiply
    391,809.80x = 587,714.70 × 372,456.20
  4. Step 4: Simplify right side
    391,809.80x = 218,897,983,846.14
  5. Step 5: Solve for x
    x = 218,897,983,846.14/391,809.80
  6. Step 6: Final answer
    x = 558,684.30

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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.