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Finding the Fourth Proportional to 81,391.72, 122,129.26 and 38,745.41

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Solution

The fourth proportional to 81,391.72, 122,129.26 and 38,745.41 is: 58,137.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,391.72 : 122,129.26 = 38,745.41 : x
  2. Step 2: Convert to fraction form
    81,391.72/122,129.26 = 38,745.41/x
  3. Step 3: Cross multiply
    81,391.72x = 122,129.26 × 38,745.41
  4. Step 4: Simplify right side
    81,391.72x = 4,731,948,251.70
  5. Step 5: Solve for x
    x = 4,731,948,251.70/81,391.72
  6. Step 6: Final answer
    x = 58,137.96

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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.