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Finding the Fourth Proportional to 81,129.67, 112,035.63 and 76,711.93

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Solution

The fourth proportional to 81,129.67, 112,035.63 and 76,711.93 is: 105,934.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,129.67 : 112,035.63 = 76,711.93 : x
  2. Step 2: Convert to fraction form
    81,129.67/112,035.63 = 76,711.93/x
  3. Step 3: Cross multiply
    81,129.67x = 112,035.63 × 76,711.93
  4. Step 4: Simplify right side
    81,129.67x = 8,594,469,406.07
  5. Step 5: Solve for x
    x = 8,594,469,406.07/81,129.67
  6. Step 6: Final answer
    x = 105,934.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.