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Finding the Fourth Proportional to 3,879.31, 5,819.20 and 1,105.77

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Solution

The fourth proportional to 3,879.31, 5,819.20 and 1,105.77 is: 1,658.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,879.31 : 5,819.20 = 1,105.77 : x
  2. Step 2: Convert to fraction form
    3,879.31/5,819.20 = 1,105.77/x
  3. Step 3: Cross multiply
    3,879.31x = 5,819.20 × 1,105.77
  4. Step 4: Simplify right side
    3,879.31x = 6,434,711.07
  5. Step 5: Solve for x
    x = 6,434,711.07/3,879.31
  6. Step 6: Final answer
    x = 1,658.72

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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.