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Finding the Fourth Proportional to 2,640.89, 3,961.34 and 791.97

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Solution

The fourth proportional to 2,640.89, 3,961.34 and 791.97 is: 1,187.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.89 : 3,961.34 = 791.97 : x
  2. Step 2: Convert to fraction form
    2,640.89/3,961.34 = 791.97/x
  3. Step 3: Cross multiply
    2,640.89x = 3,961.34 × 791.97
  4. Step 4: Simplify right side
    2,640.89x = 3,137,262.44
  5. Step 5: Solve for x
    x = 3,137,262.44/2,640.89
  6. Step 6: Final answer
    x = 1,187.96

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Similar ratio
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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.