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Finding the Fourth Proportional to 81,979.90, 122,969.85 and 80,424.70

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Solution

The fourth proportional to 81,979.90, 122,969.85 and 80,424.70 is: 120,637.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,979.90 : 122,969.85 = 80,424.70 : x
  2. Step 2: Convert to fraction form
    81,979.90/122,969.85 = 80,424.70/x
  3. Step 3: Cross multiply
    81,979.90x = 122,969.85 × 80,424.70
  4. Step 4: Simplify right side
    81,979.90x = 9,889,813,295.30
  5. Step 5: Solve for x
    x = 9,889,813,295.30/81,979.90
  6. Step 6: Final answer
    x = 120,637.05

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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.