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Finding the Fourth Proportional to 81,708.60, 122,562.90 and 71,867.10

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Solution

The fourth proportional to 81,708.60, 122,562.90 and 71,867.10 is: 107,800.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,708.60 : 122,562.90 = 71,867.10 : x
  2. Step 2: Convert to fraction form
    81,708.60/122,562.90 = 71,867.10/x
  3. Step 3: Cross multiply
    81,708.60x = 122,562.90 × 71,867.10
  4. Step 4: Simplify right side
    81,708.60x = 8,808,240,190.59
  5. Step 5: Solve for x
    x = 8,808,240,190.59/81,708.60
  6. Step 6: Final answer
    x = 107,800.65

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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.