Home / 3,929.58-5,422.71-2,161.18

Finding the Fourth Proportional to 3,929.58, 5,422.71 and 2,161.18

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Solution

The fourth proportional to 3,929.58, 5,422.71 and 2,161.18 is: 2,982.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.58 : 5,422.71 = 2,161.18 : x
  2. Step 2: Convert to fraction form
    3,929.58/5,422.71 = 2,161.18/x
  3. Step 3: Cross multiply
    3,929.58x = 5,422.71 × 2,161.18
  4. Step 4: Simplify right side
    3,929.58x = 11,719,470.38
  5. Step 5: Solve for x
    x = 11,719,470.38/3,929.58
  6. Step 6: Final answer
    x = 2,982.37

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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.