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Finding the Third Proportional to 138.75 and 207.38

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Solution

The third proportional to 138.75 and 207.38 is: 309.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.75 : 207.38 = 207.38 : x
  2. Step 2: Convert to fraction form
    138.75/207.38 = 207.38/x
  3. Step 3: Cross multiply
    138.75x = 207.38 × 207.38
  4. Step 4: Simplify right side
    138.75x = 43,004.39
  5. Step 5: Solve for x
    x = 43,004.39/138.75
  6. Step 6: Final answer
    x = 309.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.