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Finding the Fourth Proportional to 81,042.66, 121,607.64 and 39,489.66

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Solution

The fourth proportional to 81,042.66, 121,607.64 and 39,489.66 is: 59,255.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,042.66 : 121,607.64 = 39,489.66 : x
  2. Step 2: Convert to fraction form
    81,042.66/121,607.64 = 39,489.66/x
  3. Step 3: Cross multiply
    81,042.66x = 121,607.64 × 39,489.66
  4. Step 4: Simplify right side
    81,042.66x = 4,802,244,357.00
  5. Step 5: Solve for x
    x = 4,802,244,357.00/81,042.66
  6. Step 6: Final answer
    x = 59,255.76

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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.