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Finding the Fourth Proportional to 258,654.38, 387,997.97 and 81,168.39

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Solution

The fourth proportional to 258,654.38, 387,997.97 and 81,168.39 is: 121,757.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,654.38 : 387,997.97 = 81,168.39 : x
  2. Step 2: Convert to fraction form
    258,654.38/387,997.97 = 81,168.39/x
  3. Step 3: Cross multiply
    258,654.38x = 387,997.97 × 81,168.39
  4. Step 4: Simplify right side
    258,654.38x = 31,493,170,548.17
  5. Step 5: Solve for x
    x = 31,493,170,548.17/258,654.38
  6. Step 6: Final answer
    x = 121,757.73

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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.