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Finding the Third Proportional to 20.16 and 28.36

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Solution

The third proportional to 20.16 and 28.36 is: 39.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.16 : 28.36 = 28.36 : x
  2. Step 2: Convert to fraction form
    20.16/28.36 = 28.36/x
  3. Step 3: Cross multiply
    20.16x = 28.36 × 28.36
  4. Step 4: Simplify right side
    20.16x = 804.25
  5. Step 5: Solve for x
    x = 804.25/20.16
  6. Step 6: Final answer
    x = 39.90

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.