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Finding the Third Proportional to 18.79 and 39.14

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Solution

The third proportional to 18.79 and 39.14 is: 81.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.79 : 39.14 = 39.14 : x
  2. Step 2: Convert to fraction form
    18.79/39.14 = 39.14/x
  3. Step 3: Cross multiply
    18.79x = 39.14 × 39.14
  4. Step 4: Simplify right side
    18.79x = 1,531.75
  5. Step 5: Solve for x
    x = 1,531.75/18.79
  6. Step 6: Final answer
    x = 81.54

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.