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Finding the Fourth Proportional to 520,715.10, 781,115.85 and 165,719.10

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Solution

The fourth proportional to 520,715.10, 781,115.85 and 165,719.10 is: 248,592.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,715.10 : 781,115.85 = 165,719.10 : x
  2. Step 2: Convert to fraction form
    520,715.10/781,115.85 = 165,719.10/x
  3. Step 3: Cross multiply
    520,715.10x = 781,115.85 × 165,719.10
  4. Step 4: Simplify right side
    520,715.10x = 129,445,815,657.74
  5. Step 5: Solve for x
    x = 129,445,815,657.74/520,715.10
  6. Step 6: Final answer
    x = 248,592.40

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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.