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Finding the Fourth Proportional to 80,120.40, 120,358.80 and 66,998.40

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Solution

The fourth proportional to 80,120.40, 120,358.80 and 66,998.40 is: 100,646.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,120.40 : 120,358.80 = 66,998.40 : x
  2. Step 2: Convert to fraction form
    80,120.40/120,358.80 = 66,998.40/x
  3. Step 3: Cross multiply
    80,120.40x = 120,358.80 × 66,998.40
  4. Step 4: Simplify right side
    80,120.40x = 8,063,847,025.92
  5. Step 5: Solve for x
    x = 8,063,847,025.92/80,120.40
  6. Step 6: Final answer
    x = 100,646.61

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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.