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Finding the Fourth Proportional to 423,658.90, 635,487.90 and 108,115.78

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Solution

The fourth proportional to 423,658.90, 635,487.90 and 108,115.78 is: 162,173.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,658.90 : 635,487.90 = 108,115.78 : x
  2. Step 2: Convert to fraction form
    423,658.90/635,487.90 = 108,115.78/x
  3. Step 3: Cross multiply
    423,658.90x = 635,487.90 × 108,115.78
  4. Step 4: Simplify right side
    423,658.90x = 68,706,269,989.06
  5. Step 5: Solve for x
    x = 68,706,269,989.06/423,658.90
  6. Step 6: Final answer
    x = 162,173.56

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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.