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Finding the Fourth Proportional to 81,489.60, 122,234.40 and 71,121.60

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Solution

The fourth proportional to 81,489.60, 122,234.40 and 71,121.60 is: 106,682.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,489.60 : 122,234.40 = 71,121.60 : x
  2. Step 2: Convert to fraction form
    81,489.60/122,234.40 = 71,121.60/x
  3. Step 3: Cross multiply
    81,489.60x = 122,234.40 × 71,121.60
  4. Step 4: Simplify right side
    81,489.60x = 8,693,506,103.04
  5. Step 5: Solve for x
    x = 8,693,506,103.04/81,489.60
  6. Step 6: Final answer
    x = 106,682.40

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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.