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Finding the Fourth Proportional to 80,789.76, 121,203.90 and 25,385.76

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Solution

The fourth proportional to 80,789.76, 121,203.90 and 25,385.76 is: 38,084.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,789.76 : 121,203.90 = 25,385.76 : x
  2. Step 2: Convert to fraction form
    80,789.76/121,203.90 = 25,385.76/x
  3. Step 3: Cross multiply
    80,789.76x = 121,203.90 × 25,385.76
  4. Step 4: Simplify right side
    80,789.76x = 3,076,853,116.46
  5. Step 5: Solve for x
    x = 3,076,853,116.46/80,789.76
  6. Step 6: Final answer
    x = 38,084.69

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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.