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Finding the Fourth Proportional to 80,661.20, 120,847.80 and 39,016.40

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Solution

The fourth proportional to 80,661.20, 120,847.80 and 39,016.40 is: 58,454.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,661.20 : 120,847.80 = 39,016.40 : x
  2. Step 2: Convert to fraction form
    80,661.20/120,847.80 = 39,016.40/x
  3. Step 3: Cross multiply
    80,661.20x = 120,847.80 × 39,016.40
  4. Step 4: Simplify right side
    80,661.20x = 4,715,046,103.92
  5. Step 5: Solve for x
    x = 4,715,046,103.92/80,661.20
  6. Step 6: Final answer
    x = 58,454.95

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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.