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Finding the Fourth Proportional to 81,165.39, 121,775.76 and 43,729.31

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Solution

The fourth proportional to 81,165.39, 121,775.76 and 43,729.31 is: 65,608.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,165.39 : 121,775.76 = 43,729.31 : x
  2. Step 2: Convert to fraction form
    81,165.39/121,775.76 = 43,729.31/x
  3. Step 3: Cross multiply
    81,165.39x = 121,775.76 × 43,729.31
  4. Step 4: Simplify right side
    81,165.39x = 5,325,169,350.65
  5. Step 5: Solve for x
    x = 5,325,169,350.65/81,165.39
  6. Step 6: Final answer
    x = 65,608.87

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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.