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Finding the Third Proportional to 3.28 and 7.22

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Solution

The third proportional to 3.28 and 7.22 is: 15.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.28 : 7.22 = 7.22 : x
  2. Step 2: Convert to fraction form
    3.28/7.22 = 7.22/x
  3. Step 3: Cross multiply
    3.28x = 7.22 × 7.22
  4. Step 4: Simplify right side
    3.28x = 52.11
  5. Step 5: Solve for x
    x = 52.11/3.28
  6. Step 6: Final answer
    x = 15.88

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.