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Finding the Fourth Proportional to 81,165.80, 121,748.70 and 68,724.20

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Solution

The fourth proportional to 81,165.80, 121,748.70 and 68,724.20 is: 103,086.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,165.80 : 121,748.70 = 68,724.20 : x
  2. Step 2: Convert to fraction form
    81,165.80/121,748.70 = 68,724.20/x
  3. Step 3: Cross multiply
    81,165.80x = 121,748.70 × 68,724.20
  4. Step 4: Simplify right side
    81,165.80x = 8,367,082,008.54
  5. Step 5: Solve for x
    x = 8,367,082,008.54/81,165.80
  6. Step 6: Final answer
    x = 103,086.30

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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.