Home / 3,929.60-5,422.82-2,161.32

Finding the Fourth Proportional to 3,929.60, 5,422.82 and 2,161.32

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Solution

The fourth proportional to 3,929.60, 5,422.82 and 2,161.32 is: 2,982.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.60 : 5,422.82 = 2,161.32 : x
  2. Step 2: Convert to fraction form
    3,929.60/5,422.82 = 2,161.32/x
  3. Step 3: Cross multiply
    3,929.60x = 5,422.82 × 2,161.32
  4. Step 4: Simplify right side
    3,929.60x = 11,720,449.32
  5. Step 5: Solve for x
    x = 11,720,449.32/3,929.60
  6. Step 6: Final answer
    x = 2,982.61

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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.