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Finding the Fourth Proportional to 679,704.06, 937,757.98 and 421,488.20

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Solution

The fourth proportional to 679,704.06, 937,757.98 and 421,488.20 is: 581,508.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,704.06 : 937,757.98 = 421,488.20 : x
  2. Step 2: Convert to fraction form
    679,704.06/937,757.98 = 421,488.20/x
  3. Step 3: Cross multiply
    679,704.06x = 937,757.98 × 421,488.20
  4. Step 4: Simplify right side
    679,704.06x = 395,253,923,025.84
  5. Step 5: Solve for x
    x = 395,253,923,025.84/679,704.06
  6. Step 6: Final answer
    x = 581,508.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.