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Finding the Third Proportional to 138.75 and 203.25

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Solution

The third proportional to 138.75 and 203.25 is: 297.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.75 : 203.25 = 203.25 : x
  2. Step 2: Convert to fraction form
    138.75/203.25 = 203.25/x
  3. Step 3: Cross multiply
    138.75x = 203.25 × 203.25
  4. Step 4: Simplify right side
    138.75x = 41,310.56
  5. Step 5: Solve for x
    x = 41,310.56/138.75
  6. Step 6: Final answer
    x = 297.73

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.