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Finding the Fourth Proportional to 83,919.20, 125,878.80 and 80,638.70

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Solution

The fourth proportional to 83,919.20, 125,878.80 and 80,638.70 is: 120,958.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,919.20 : 125,878.80 = 80,638.70 : x
  2. Step 2: Convert to fraction form
    83,919.20/125,878.80 = 80,638.70/x
  3. Step 3: Cross multiply
    83,919.20x = 125,878.80 × 80,638.70
  4. Step 4: Simplify right side
    83,919.20x = 10,150,702,789.56
  5. Step 5: Solve for x
    x = 10,150,702,789.56/83,919.20
  6. Step 6: Final answer
    x = 120,958.05

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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.