Home / 3,929.85-5,423.17-2,161.42

Finding the Fourth Proportional to 3,929.85, 5,423.17 and 2,161.42

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Solution

The fourth proportional to 3,929.85, 5,423.17 and 2,161.42 is: 2,982.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.85 : 5,423.17 = 2,161.42 : x
  2. Step 2: Convert to fraction form
    3,929.85/5,423.17 = 2,161.42/x
  3. Step 3: Cross multiply
    3,929.85x = 5,423.17 × 2,161.42
  4. Step 4: Simplify right side
    3,929.85x = 11,721,748.10
  5. Step 5: Solve for x
    x = 11,721,748.10/3,929.85
  6. Step 6: Final answer
    x = 2,982.75

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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.