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Finding the Third Proportional to 138.13 and 206.75

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Solution

The third proportional to 138.13 and 206.75 is: 309.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.13 : 206.75 = 206.75 : x
  2. Step 2: Convert to fraction form
    138.13/206.75 = 206.75/x
  3. Step 3: Cross multiply
    138.13x = 206.75 × 206.75
  4. Step 4: Simplify right side
    138.13x = 42,745.56
  5. Step 5: Solve for x
    x = 42,745.56/138.13
  6. Step 6: Final answer
    x = 309.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.