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Finding the Fourth Proportional to 138,951.52, 191,750.58 and 78,520.86

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Solution

The fourth proportional to 138,951.52, 191,750.58 and 78,520.86 is: 108,357.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,951.52 : 191,750.58 = 78,520.86 : x
  2. Step 2: Convert to fraction form
    138,951.52/191,750.58 = 78,520.86/x
  3. Step 3: Cross multiply
    138,951.52x = 191,750.58 × 78,520.86
  4. Step 4: Simplify right side
    138,951.52x = 15,056,420,447.10
  5. Step 5: Solve for x
    x = 15,056,420,447.10/138,951.52
  6. Step 6: Final answer
    x = 108,357.36

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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.