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Finding the Fourth Proportional to 425,680.11, 638,520.17 and 145,199.79

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Solution

The fourth proportional to 425,680.11, 638,520.17 and 145,199.79 is: 217,799.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,680.11 : 638,520.17 = 145,199.79 : x
  2. Step 2: Convert to fraction form
    425,680.11/638,520.17 = 145,199.79/x
  3. Step 3: Cross multiply
    425,680.11x = 638,520.17 × 145,199.79
  4. Step 4: Simplify right side
    425,680.11x = 92,712,993,868.77
  5. Step 5: Solve for x
    x = 92,712,993,868.77/425,680.11
  6. Step 6: Final answer
    x = 217,799.69

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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.