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Finding the Third Proportional to 19.50 and 20.81

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Solution

The third proportional to 19.50 and 20.81 is: 22.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.50 : 20.81 = 20.81 : x
  2. Step 2: Convert to fraction form
    19.50/20.81 = 20.81/x
  3. Step 3: Cross multiply
    19.50x = 20.81 × 20.81
  4. Step 4: Simplify right side
    19.50x = 433.16
  5. Step 5: Solve for x
    x = 433.16/19.50
  6. Step 6: Final answer
    x = 22.21

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Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.