Home / 3,929.13-5,422.41-2,160.90

Finding the Fourth Proportional to 3,929.13, 5,422.41 and 2,160.90

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Solution

The fourth proportional to 3,929.13, 5,422.41 and 2,160.90 is: 2,982.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.13 : 5,422.41 = 2,160.90 : x
  2. Step 2: Convert to fraction form
    3,929.13/5,422.41 = 2,160.90/x
  3. Step 3: Cross multiply
    3,929.13x = 5,422.41 × 2,160.90
  4. Step 4: Simplify right side
    3,929.13x = 11,717,285.77
  5. Step 5: Solve for x
    x = 11,717,285.77/3,929.13
  6. Step 6: Final answer
    x = 2,982.16

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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.