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Finding the Fourth Proportional to 3,876.86, 5,815.26 and 1,279.79

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Solution

The fourth proportional to 3,876.86, 5,815.26 and 1,279.79 is: 1,919.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,876.86 : 5,815.26 = 1,279.79 : x
  2. Step 2: Convert to fraction form
    3,876.86/5,815.26 = 1,279.79/x
  3. Step 3: Cross multiply
    3,876.86x = 5,815.26 × 1,279.79
  4. Step 4: Simplify right side
    3,876.86x = 7,442,311.60
  5. Step 5: Solve for x
    x = 7,442,311.60/3,876.86
  6. Step 6: Final answer
    x = 1,919.68

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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.