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Finding the Third Proportional to 138 and 178.75

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Solution

The third proportional to 138 and 178.75 is: 231.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    138 : 178.75 = 178.75 : x
  2. Step 2: Convert to fraction form
    138/178.75 = 178.75/x
  3. Step 3: Cross multiply
    138x = 178.75 × 178.75
  4. Step 4: Simplify right side
    138x = 31,951.56
  5. Step 5: Solve for x
    x = 31,951.56/138
  6. Step 6: Final answer
    x = 231.53

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.