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Finding the Fourth Proportional to 81,957.40, 122,936.10 and 81,179.80

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Solution

The fourth proportional to 81,957.40, 122,936.10 and 81,179.80 is: 121,769.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,957.40 : 122,936.10 = 81,179.80 : x
  2. Step 2: Convert to fraction form
    81,957.40/122,936.10 = 81,179.80/x
  3. Step 3: Cross multiply
    81,957.40x = 122,936.10 × 81,179.80
  4. Step 4: Simplify right side
    81,957.40x = 9,979,928,010.78
  5. Step 5: Solve for x
    x = 9,979,928,010.78/81,957.40
  6. Step 6: Final answer
    x = 121,769.70

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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.