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Finding the Third Proportional to 138.38 and 243

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Solution

The third proportional to 138.38 and 243 is: 426.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.38 : 243 = 243 : x
  2. Step 2: Convert to fraction form
    138.38/243 = 243/x
  3. Step 3: Cross multiply
    138.38x = 243 × 243
  4. Step 4: Simplify right side
    138.38x = 59,049
  5. Step 5: Solve for x
    x = 59,049/138.38
  6. Step 6: Final answer
    x = 426.73

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Why These Related Problems?

These problems maintain the same ratio (1.76) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.