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Finding the Third Proportional to 20.81 and 38.75

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Solution

The third proportional to 20.81 and 38.75 is: 72.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.81 : 38.75 = 38.75 : x
  2. Step 2: Convert to fraction form
    20.81/38.75 = 38.75/x
  3. Step 3: Cross multiply
    20.81x = 38.75 × 38.75
  4. Step 4: Simplify right side
    20.81x = 1,501.56
  5. Step 5: Solve for x
    x = 1,501.56/20.81
  6. Step 6: Final answer
    x = 72.15

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.