Home / 3,929.88-5,423.20-2,161.48

Finding the Fourth Proportional to 3,929.88, 5,423.20 and 2,161.48

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Solution

The fourth proportional to 3,929.88, 5,423.20 and 2,161.48 is: 2,982.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.88 : 5,423.20 = 2,161.48 : x
  2. Step 2: Convert to fraction form
    3,929.88/5,423.20 = 2,161.48/x
  3. Step 3: Cross multiply
    3,929.88x = 5,423.20 × 2,161.48
  4. Step 4: Simplify right side
    3,929.88x = 11,722,138.34
  5. Step 5: Solve for x
    x = 11,722,138.34/3,929.88
  6. Step 6: Final answer
    x = 2,982.82

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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.