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Finding the Fourth Proportional to 8,676.92, 12,997.96 and 3,990.42

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Solution

The fourth proportional to 8,676.92, 12,997.96 and 3,990.42 is: 5,977.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,676.92 : 12,997.96 = 3,990.42 : x
  2. Step 2: Convert to fraction form
    8,676.92/12,997.96 = 3,990.42/x
  3. Step 3: Cross multiply
    8,676.92x = 12,997.96 × 3,990.42
  4. Step 4: Simplify right side
    8,676.92x = 51,867,313.09
  5. Step 5: Solve for x
    x = 51,867,313.09/8,676.92
  6. Step 6: Final answer
    x = 5,977.62

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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.