Home / 3,930.13-5,423.79-2,161.90

Finding the Fourth Proportional to 3,930.13, 5,423.79 and 2,161.90

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Solution

The fourth proportional to 3,930.13, 5,423.79 and 2,161.90 is: 2,983.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,930.13 : 5,423.79 = 2,161.90 : x
  2. Step 2: Convert to fraction form
    3,930.13/5,423.79 = 2,161.90/x
  3. Step 3: Cross multiply
    3,930.13x = 5,423.79 × 2,161.90
  4. Step 4: Simplify right side
    3,930.13x = 11,725,691.60
  5. Step 5: Solve for x
    x = 11,725,691.60/3,930.13
  6. Step 6: Final answer
    x = 2,983.54

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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.