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Finding the Fourth Proportional to 81,000.80, 121,355.40 and 66,129.20

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Solution

The fourth proportional to 81,000.80, 121,355.40 and 66,129.20 is: 99,074.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,000.80 : 121,355.40 = 66,129.20 : x
  2. Step 2: Convert to fraction form
    81,000.80/121,355.40 = 66,129.20/x
  3. Step 3: Cross multiply
    81,000.80x = 121,355.40 × 66,129.20
  4. Step 4: Simplify right side
    81,000.80x = 8,025,135,517.68
  5. Step 5: Solve for x
    x = 8,025,135,517.68/81,000.80
  6. Step 6: Final answer
    x = 99,074.77

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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.