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Finding the Fourth Proportional to 81,428.60, 122,138.85 and 41,989.70

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Solution

The fourth proportional to 81,428.60, 122,138.85 and 41,989.70 is: 62,982.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,428.60 : 122,138.85 = 41,989.70 : x
  2. Step 2: Convert to fraction form
    81,428.60/122,138.85 = 41,989.70/x
  3. Step 3: Cross multiply
    81,428.60x = 122,138.85 × 41,989.70
  4. Step 4: Simplify right side
    81,428.60x = 5,128,573,669.85
  5. Step 5: Solve for x
    x = 5,128,573,669.85/81,428.60
  6. Step 6: Final answer
    x = 62,982.46

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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.