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Finding the Third Proportional to 19 and 20.38

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Solution

The third proportional to 19 and 20.38 is: 21.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    19 : 20.38 = 20.38 : x
  2. Step 2: Convert to fraction form
    19/20.38 = 20.38/x
  3. Step 3: Cross multiply
    19x = 20.38 × 20.38
  4. Step 4: Simplify right side
    19x = 415.14
  5. Step 5: Solve for x
    x = 415.14/19
  6. Step 6: Final answer
    x = 21.85

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.