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Finding the Third Proportional to 3.28 and 5.11

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Solution

The third proportional to 3.28 and 5.11 is: 7.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.28 : 5.11 = 5.11 : x
  2. Step 2: Convert to fraction form
    3.28/5.11 = 5.11/x
  3. Step 3: Cross multiply
    3.28x = 5.11 × 5.11
  4. Step 4: Simplify right side
    3.28x = 26.11
  5. Step 5: Solve for x
    x = 26.11/3.28
  6. Step 6: Final answer
    x = 7.96

Related Problems

Find third proportional to 1.64 and 2.55
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.