Home / 3,890.91-5,370.66-2,399.30

Finding the Fourth Proportional to 3,890.91, 5,370.66 and 2,399.30

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Solution

The fourth proportional to 3,890.91, 5,370.66 and 2,399.30 is: 3,311.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.91 : 5,370.66 = 2,399.30 : x
  2. Step 2: Convert to fraction form
    3,890.91/5,370.66 = 2,399.30/x
  3. Step 3: Cross multiply
    3,890.91x = 5,370.66 × 2,399.30
  4. Step 4: Simplify right side
    3,890.91x = 12,885,824.54
  5. Step 5: Solve for x
    x = 12,885,824.54/3,890.91
  6. Step 6: Final answer
    x = 3,311.78

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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.