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Finding the Third Proportional to 18.50 and 20.13

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Solution

The third proportional to 18.50 and 20.13 is: 21.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.50 : 20.13 = 20.13 : x
  2. Step 2: Convert to fraction form
    18.50/20.13 = 20.13/x
  3. Step 3: Cross multiply
    18.50x = 20.13 × 20.13
  4. Step 4: Simplify right side
    18.50x = 405.02
  5. Step 5: Solve for x
    x = 405.02/18.50
  6. Step 6: Final answer
    x = 21.89

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.