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Finding the Fourth Proportional to 2,761.92, 4,142.97 and 813.96

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Solution

The fourth proportional to 2,761.92, 4,142.97 and 813.96 is: 1,220.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,761.92 : 4,142.97 = 813.96 : x
  2. Step 2: Convert to fraction form
    2,761.92/4,142.97 = 813.96/x
  3. Step 3: Cross multiply
    2,761.92x = 4,142.97 × 813.96
  4. Step 4: Simplify right side
    2,761.92x = 3,372,211.86
  5. Step 5: Solve for x
    x = 3,372,211.86/2,761.92
  6. Step 6: Final answer
    x = 1,220.97

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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.