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Finding the Fourth Proportional to 521,123.90, 781,685.85 and 486,131.90

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Solution

The fourth proportional to 521,123.90, 781,685.85 and 486,131.90 is: 729,197.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,123.90 : 781,685.85 = 486,131.90 : x
  2. Step 2: Convert to fraction form
    521,123.90/781,685.85 = 486,131.90/x
  3. Step 3: Cross multiply
    521,123.90x = 781,685.85 × 486,131.90
  4. Step 4: Simplify right side
    521,123.90x = 380,002,427,463.62
  5. Step 5: Solve for x
    x = 380,002,427,463.62/521,123.90
  6. Step 6: Final answer
    x = 729,197.85

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Double scale
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Similar ratio
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1.5x scale

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.