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Finding the Fourth Proportional to 139,660.80, 209,404.80 and 80,467.20

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Solution

The fourth proportional to 139,660.80, 209,404.80 and 80,467.20 is: 120,651.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,660.80 : 209,404.80 = 80,467.20 : x
  2. Step 2: Convert to fraction form
    139,660.80/209,404.80 = 80,467.20/x
  3. Step 3: Cross multiply
    139,660.80x = 209,404.80 × 80,467.20
  4. Step 4: Simplify right side
    139,660.80x = 16,850,217,922.56
  5. Step 5: Solve for x
    x = 16,850,217,922.56/139,660.80
  6. Step 6: Final answer
    x = 120,651.02

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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.