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Finding the Third Proportional to 17.81 and 38.75

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Solution

The third proportional to 17.81 and 38.75 is: 84.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.81 : 38.75 = 38.75 : x
  2. Step 2: Convert to fraction form
    17.81/38.75 = 38.75/x
  3. Step 3: Cross multiply
    17.81x = 38.75 × 38.75
  4. Step 4: Simplify right side
    17.81x = 1,501.73
  5. Step 5: Solve for x
    x = 1,501.73/17.81
  6. Step 6: Final answer
    x = 84.30

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.