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Finding the Fourth Proportional to 138,129.78, 207,174.15 and 38,279.57

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Solution

The fourth proportional to 138,129.78, 207,174.15 and 38,279.57 is: 57,413.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,129.78 : 207,174.15 = 38,279.57 : x
  2. Step 2: Convert to fraction form
    138,129.78/207,174.15 = 38,279.57/x
  3. Step 3: Cross multiply
    138,129.78x = 207,174.15 × 38,279.57
  4. Step 4: Simplify right side
    138,129.78x = 7,930,536,149.85
  5. Step 5: Solve for x
    x = 7,930,536,149.85/138,129.78
  6. Step 6: Final answer
    x = 57,413.66

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1.5x scale

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.