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Finding the Fourth Proportional to 3,891.86, 5,370.55 and 2,399.91

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Solution

The fourth proportional to 3,891.86, 5,370.55 and 2,399.91 is: 3,311.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.86 : 5,370.55 = 2,399.91 : x
  2. Step 2: Convert to fraction form
    3,891.86/5,370.55 = 2,399.91/x
  3. Step 3: Cross multiply
    3,891.86x = 5,370.55 × 2,399.91
  4. Step 4: Simplify right side
    3,891.86x = 12,888,836.65
  5. Step 5: Solve for x
    x = 12,888,836.65/3,891.86
  6. Step 6: Final answer
    x = 3,311.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.