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Finding the Fourth Proportional to 80,951.90, 121,427.85 and 72,422.60

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Solution

The fourth proportional to 80,951.90, 121,427.85 and 72,422.60 is: 108,633.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,951.90 : 121,427.85 = 72,422.60 : x
  2. Step 2: Convert to fraction form
    80,951.90/121,427.85 = 72,422.60/x
  3. Step 3: Cross multiply
    80,951.90x = 121,427.85 × 72,422.60
  4. Step 4: Simplify right side
    80,951.90x = 8,794,120,609.41
  5. Step 5: Solve for x
    x = 8,794,120,609.41/80,951.90
  6. Step 6: Final answer
    x = 108,633.90

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1.5x scale

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.