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Finding the Fourth Proportional to 80,043.20, 120,064.86 and 20,878.80

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Solution

The fourth proportional to 80,043.20, 120,064.86 and 20,878.80 is: 31,318.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,043.20 : 120,064.86 = 20,878.80 : x
  2. Step 2: Convert to fraction form
    80,043.20/120,064.86 = 20,878.80/x
  3. Step 3: Cross multiply
    80,043.20x = 120,064.86 × 20,878.80
  4. Step 4: Simplify right side
    80,043.20x = 2,506,810,198.97
  5. Step 5: Solve for x
    x = 2,506,810,198.97/80,043.20
  6. Step 6: Final answer
    x = 31,318.22

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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.