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Finding the Fourth Proportional to 3,919.43, 5,879.28 and 1,286.99

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Solution

The fourth proportional to 3,919.43, 5,879.28 and 1,286.99 is: 1,930.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919.43 : 5,879.28 = 1,286.99 : x
  2. Step 2: Convert to fraction form
    3,919.43/5,879.28 = 1,286.99/x
  3. Step 3: Cross multiply
    3,919.43x = 5,879.28 × 1,286.99
  4. Step 4: Simplify right side
    3,919.43x = 7,566,568.13
  5. Step 5: Solve for x
    x = 7,566,568.13/3,919.43
  6. Step 6: Final answer
    x = 1,930.53

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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.