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Finding the Fourth Proportional to 521,013.70, 781,520.55 and 311,061.70

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Solution

The fourth proportional to 521,013.70, 781,520.55 and 311,061.70 is: 466,592.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,013.70 : 781,520.55 = 311,061.70 : x
  2. Step 2: Convert to fraction form
    521,013.70/781,520.55 = 311,061.70/x
  3. Step 3: Cross multiply
    521,013.70x = 781,520.55 × 311,061.70
  4. Step 4: Simplify right side
    521,013.70x = 243,101,110,867.94
  5. Step 5: Solve for x
    x = 243,101,110,867.94/521,013.70
  6. Step 6: Final answer
    x = 466,592.55

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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.