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Finding the Fourth Proportional to 81,162.80, 121,744.20 and 68,721.20

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Solution

The fourth proportional to 81,162.80, 121,744.20 and 68,721.20 is: 103,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,162.80 : 121,744.20 = 68,721.20 : x
  2. Step 2: Convert to fraction form
    81,162.80/121,744.20 = 68,721.20/x
  3. Step 3: Cross multiply
    81,162.80x = 121,744.20 × 68,721.20
  4. Step 4: Simplify right side
    81,162.80x = 8,366,407,517.04
  5. Step 5: Solve for x
    x = 8,366,407,517.04/81,162.80
  6. Step 6: Final answer
    x = 103,081.80

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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.