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Finding the Fourth Proportional to 3,911.92, 5,867.90 and 1,138.61

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Solution

The fourth proportional to 3,911.92, 5,867.90 and 1,138.61 is: 1,707.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.92 : 5,867.90 = 1,138.61 : x
  2. Step 2: Convert to fraction form
    3,911.92/5,867.90 = 1,138.61/x
  3. Step 3: Cross multiply
    3,911.92x = 5,867.90 × 1,138.61
  4. Step 4: Simplify right side
    3,911.92x = 6,681,230.66
  5. Step 5: Solve for x
    x = 6,681,230.66/3,911.92
  6. Step 6: Final answer
    x = 1,707.92

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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.