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Finding the Third Proportional to 138.38 and 260.38

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Solution

The third proportional to 138.38 and 260.38 is: 489.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.38 : 260.38 = 260.38 : x
  2. Step 2: Convert to fraction form
    138.38/260.38 = 260.38/x
  3. Step 3: Cross multiply
    138.38x = 260.38 × 260.38
  4. Step 4: Simplify right side
    138.38x = 67,795.14
  5. Step 5: Solve for x
    x = 67,795.14/138.38
  6. Step 6: Final answer
    x = 489.94

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Why These Related Problems?

These problems maintain the same ratio (1.88) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.