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Finding the Fourth Proportional to 20,649.92, 30,963.90 and 8,169.44

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Solution

The fourth proportional to 20,649.92, 30,963.90 and 8,169.44 is: 12,249.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,649.92 : 30,963.90 = 8,169.44 : x
  2. Step 2: Convert to fraction form
    20,649.92/30,963.90 = 8,169.44/x
  3. Step 3: Cross multiply
    20,649.92x = 30,963.90 × 8,169.44
  4. Step 4: Simplify right side
    20,649.92x = 252,957,723.22
  5. Step 5: Solve for x
    x = 252,957,723.22/20,649.92
  6. Step 6: Final answer
    x = 12,249.82

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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.