Home / 3,929.76-5,423.10-2,161.38

Finding the Fourth Proportional to 3,929.76, 5,423.10 and 2,161.38

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Solution

The fourth proportional to 3,929.76, 5,423.10 and 2,161.38 is: 2,982.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.76 : 5,423.10 = 2,161.38 : x
  2. Step 2: Convert to fraction form
    3,929.76/5,423.10 = 2,161.38/x
  3. Step 3: Cross multiply
    3,929.76x = 5,423.10 × 2,161.38
  4. Step 4: Simplify right side
    3,929.76x = 11,721,379.88
  5. Step 5: Solve for x
    x = 11,721,379.88/3,929.76
  6. Step 6: Final answer
    x = 2,982.72

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1.5x scale

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.