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Finding the Fourth Proportional to 520,859.70, 781,362.45 and 221,337.90

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Solution

The fourth proportional to 520,859.70, 781,362.45 and 221,337.90 is: 332,037.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,859.70 : 781,362.45 = 221,337.90 : x
  2. Step 2: Convert to fraction form
    520,859.70/781,362.45 = 221,337.90/x
  3. Step 3: Cross multiply
    520,859.70x = 781,362.45 × 221,337.90
  4. Step 4: Simplify right side
    520,859.70x = 172,945,123,821.86
  5. Step 5: Solve for x
    x = 172,945,123,821.86/520,859.70
  6. Step 6: Final answer
    x = 332,037.83

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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.