Home / 3,899.28-5,380.56-2,220.72

Finding the Fourth Proportional to 3,899.28, 5,380.56 and 2,220.72

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Solution

The fourth proportional to 3,899.28, 5,380.56 and 2,220.72 is: 3,064.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.28 : 5,380.56 = 2,220.72 : x
  2. Step 2: Convert to fraction form
    3,899.28/5,380.56 = 2,220.72/x
  3. Step 3: Cross multiply
    3,899.28x = 5,380.56 × 2,220.72
  4. Step 4: Simplify right side
    3,899.28x = 11,948,717.20
  5. Step 5: Solve for x
    x = 11,948,717.20/3,899.28
  6. Step 6: Final answer
    x = 3,064.34

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Double scale
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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.