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Finding the Third Proportional to 138.50 and 208

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Solution

The third proportional to 138.50 and 208 is: 312.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.50 : 208 = 208 : x
  2. Step 2: Convert to fraction form
    138.50/208 = 208/x
  3. Step 3: Cross multiply
    138.50x = 208 × 208
  4. Step 4: Simplify right side
    138.50x = 43,264
  5. Step 5: Solve for x
    x = 43,264/138.50
  6. Step 6: Final answer
    x = 312.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.