Home / 3,929.55-5,422.92-2,161.32

Finding the Fourth Proportional to 3,929.55, 5,422.92 and 2,161.32

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Solution

The fourth proportional to 3,929.55, 5,422.92 and 2,161.32 is: 2,982.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.55 : 5,422.92 = 2,161.32 : x
  2. Step 2: Convert to fraction form
    3,929.55/5,422.92 = 2,161.32/x
  3. Step 3: Cross multiply
    3,929.55x = 5,422.92 × 2,161.32
  4. Step 4: Simplify right side
    3,929.55x = 11,720,665.45
  5. Step 5: Solve for x
    x = 11,720,665.45/3,929.55
  6. Step 6: Final answer
    x = 2,982.70

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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.