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Finding the Fourth Proportional to 80,904.20, 121,502.10 and 78,279.80

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Solution

The fourth proportional to 80,904.20, 121,502.10 and 78,279.80 is: 117,560.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,904.20 : 121,502.10 = 78,279.80 : x
  2. Step 2: Convert to fraction form
    80,904.20/121,502.10 = 78,279.80/x
  3. Step 3: Cross multiply
    80,904.20x = 121,502.10 × 78,279.80
  4. Step 4: Simplify right side
    80,904.20x = 9,511,160,087.58
  5. Step 5: Solve for x
    x = 9,511,160,087.58/80,904.20
  6. Step 6: Final answer
    x = 117,560.77

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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.