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Finding the Fourth Proportional to 128,486.90, 192,769.78 and 57,469.29

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Solution

The fourth proportional to 128,486.90, 192,769.78 and 57,469.29 is: 86,221.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,486.90 : 192,769.78 = 57,469.29 : x
  2. Step 2: Convert to fraction form
    128,486.90/192,769.78 = 57,469.29/x
  3. Step 3: Cross multiply
    128,486.90x = 192,769.78 × 57,469.29
  4. Step 4: Simplify right side
    128,486.90x = 11,078,341,138.86
  5. Step 5: Solve for x
    x = 11,078,341,138.86/128,486.90
  6. Step 6: Final answer
    x = 86,221.56

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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.