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Finding the Fourth Proportional to 84,079.68, 126,141.60 and 31,489.92

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Solution

The fourth proportional to 84,079.68, 126,141.60 and 31,489.92 is: 47,243.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,079.68 : 126,141.60 = 31,489.92 : x
  2. Step 2: Convert to fraction form
    84,079.68/126,141.60 = 31,489.92/x
  3. Step 3: Cross multiply
    84,079.68x = 126,141.60 × 31,489.92
  4. Step 4: Simplify right side
    84,079.68x = 3,972,188,892.67
  5. Step 5: Solve for x
    x = 3,972,188,892.67/84,079.68
  6. Step 6: Final answer
    x = 47,243.15

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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.