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Finding the Fourth Proportional to 5,255.78, 7,876.22 and 2,791.76

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Solution

The fourth proportional to 5,255.78, 7,876.22 and 2,791.76 is: 4,183.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,255.78 : 7,876.22 = 2,791.76 : x
  2. Step 2: Convert to fraction form
    5,255.78/7,876.22 = 2,791.76/x
  3. Step 3: Cross multiply
    5,255.78x = 7,876.22 × 2,791.76
  4. Step 4: Simplify right side
    5,255.78x = 21,988,515.95
  5. Step 5: Solve for x
    x = 21,988,515.95/5,255.78
  6. Step 6: Final answer
    x = 4,183.68

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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.