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Finding the Fourth Proportional to 425,685.78, 638,944.20 and 351,561.06

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Solution

The fourth proportional to 425,685.78, 638,944.20 and 351,561.06 is: 527,684.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,685.78 : 638,944.20 = 351,561.06 : x
  2. Step 2: Convert to fraction form
    425,685.78/638,944.20 = 351,561.06/x
  3. Step 3: Cross multiply
    425,685.78x = 638,944.20 × 351,561.06
  4. Step 4: Simplify right side
    425,685.78x = 224,627,900,232.85
  5. Step 5: Solve for x
    x = 224,627,900,232.85/425,685.78
  6. Step 6: Final answer
    x = 527,684.76

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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.