Home / 3,929.71-5,423.12-2,161.43

Finding the Fourth Proportional to 3,929.71, 5,423.12 and 2,161.43

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Solution

The fourth proportional to 3,929.71, 5,423.12 and 2,161.43 is: 2,982.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.71 : 5,423.12 = 2,161.43 : x
  2. Step 2: Convert to fraction form
    3,929.71/5,423.12 = 2,161.43/x
  3. Step 3: Cross multiply
    3,929.71x = 5,423.12 × 2,161.43
  4. Step 4: Simplify right side
    3,929.71x = 11,721,694.26
  5. Step 5: Solve for x
    x = 11,721,694.26/3,929.71
  6. Step 6: Final answer
    x = 2,982.84

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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.