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Finding the Fourth Proportional to 20,622.87, 30,913.17 and 8,137.85

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Solution

The fourth proportional to 20,622.87, 30,913.17 and 8,137.85 is: 12,198.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,622.87 : 30,913.17 = 8,137.85 : x
  2. Step 2: Convert to fraction form
    20,622.87/30,913.17 = 8,137.85/x
  3. Step 3: Cross multiply
    20,622.87x = 30,913.17 × 8,137.85
  4. Step 4: Simplify right side
    20,622.87x = 251,566,585.92
  5. Step 5: Solve for x
    x = 251,566,585.92/20,622.87
  6. Step 6: Final answer
    x = 12,198.43

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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.