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Finding the Fourth Proportional to 520,472.40, 781,003.92 and 239,989.68

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Solution

The fourth proportional to 520,472.40, 781,003.92 and 239,989.68 is: 360,120.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,472.40 : 781,003.92 = 239,989.68 : x
  2. Step 2: Convert to fraction form
    520,472.40/781,003.92 = 239,989.68/x
  3. Step 3: Cross multiply
    520,472.40x = 781,003.92 × 239,989.68
  4. Step 4: Simplify right side
    520,472.40x = 187,432,880,839.55
  5. Step 5: Solve for x
    x = 187,432,880,839.55/520,472.40
  6. Step 6: Final answer
    x = 360,120.69

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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.