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Finding the Third Proportional to 138.38 and 272.63

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Solution

The third proportional to 138.38 and 272.63 is: 537.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.38 : 272.63 = 272.63 : x
  2. Step 2: Convert to fraction form
    138.38/272.63 = 272.63/x
  3. Step 3: Cross multiply
    138.38x = 272.63 × 272.63
  4. Step 4: Simplify right side
    138.38x = 74,324.39
  5. Step 5: Solve for x
    x = 74,324.39/138.38
  6. Step 6: Final answer
    x = 537.12

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.