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Finding the Fourth Proportional to 84,691.44, 126,991.71 and 28,512.81

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Solution

The fourth proportional to 84,691.44, 126,991.71 and 28,512.81 is: 42,753.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,691.44 : 126,991.71 = 28,512.81 : x
  2. Step 2: Convert to fraction form
    84,691.44/126,991.71 = 28,512.81/x
  3. Step 3: Cross multiply
    84,691.44x = 126,991.71 × 28,512.81
  4. Step 4: Simplify right side
    84,691.44x = 3,620,890,498.81
  5. Step 5: Solve for x
    x = 3,620,890,498.81/84,691.44
  6. Step 6: Final answer
    x = 42,753.91

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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.