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Finding the Fourth Proportional to 81,020.80, 121,531.20 and 71,179.30

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Solution

The fourth proportional to 81,020.80, 121,531.20 and 71,179.30 is: 106,768.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,020.80 : 121,531.20 = 71,179.30 : x
  2. Step 2: Convert to fraction form
    81,020.80/121,531.20 = 71,179.30/x
  3. Step 3: Cross multiply
    81,020.80x = 121,531.20 × 71,179.30
  4. Step 4: Simplify right side
    81,020.80x = 8,650,505,744.16
  5. Step 5: Solve for x
    x = 8,650,505,744.16/81,020.80
  6. Step 6: Final answer
    x = 106,768.95

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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.