Home / 3,929.80-5,422.98-2,161.39

Finding the Fourth Proportional to 3,929.80, 5,422.98 and 2,161.39

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Solution

The fourth proportional to 3,929.80, 5,422.98 and 2,161.39 is: 2,982.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.80 : 5,422.98 = 2,161.39 : x
  2. Step 2: Convert to fraction form
    3,929.80/5,422.98 = 2,161.39/x
  3. Step 3: Cross multiply
    3,929.80x = 5,422.98 × 2,161.39
  4. Step 4: Simplify right side
    3,929.80x = 11,721,174.74
  5. Step 5: Solve for x
    x = 11,721,174.74/3,929.80
  6. Step 6: Final answer
    x = 2,982.64

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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.