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Finding the Fourth Proportional to 7,961.92, 11,940.96 and 2,489.92

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Solution

The fourth proportional to 7,961.92, 11,940.96 and 2,489.92 is: 3,734.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,961.92 : 11,940.96 = 2,489.92 : x
  2. Step 2: Convert to fraction form
    7,961.92/11,940.96 = 2,489.92/x
  3. Step 3: Cross multiply
    7,961.92x = 11,940.96 × 2,489.92
  4. Step 4: Simplify right side
    7,961.92x = 29,732,035.12
  5. Step 5: Solve for x
    x = 29,732,035.12/7,961.92
  6. Step 6: Final answer
    x = 3,734.28

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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.