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Finding the Third Proportional to 18.94 and 38.84

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Solution

The third proportional to 18.94 and 38.84 is: 79.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.94 : 38.84 = 38.84 : x
  2. Step 2: Convert to fraction form
    18.94/38.84 = 38.84/x
  3. Step 3: Cross multiply
    18.94x = 38.84 × 38.84
  4. Step 4: Simplify right side
    18.94x = 1,508.84
  5. Step 5: Solve for x
    x = 1,508.84/18.94
  6. Step 6: Final answer
    x = 79.67

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.