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Finding the Fourth Proportional to 81,387.92, 122,116.96 and 43,940.55

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Solution

The fourth proportional to 81,387.92, 122,116.96 and 43,940.55 is: 65,929.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,387.92 : 122,116.96 = 43,940.55 : x
  2. Step 2: Convert to fraction form
    81,387.92/122,116.96 = 43,940.55/x
  3. Step 3: Cross multiply
    81,387.92x = 122,116.96 × 43,940.55
  4. Step 4: Simplify right side
    81,387.92x = 5,365,886,167.03
  5. Step 5: Solve for x
    x = 5,365,886,167.03/81,387.92
  6. Step 6: Final answer
    x = 65,929.77

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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.