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Finding the Third Proportional to 138.50 and 221.75

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Solution

The third proportional to 138.50 and 221.75 is: 355.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.50 : 221.75 = 221.75 : x
  2. Step 2: Convert to fraction form
    138.50/221.75 = 221.75/x
  3. Step 3: Cross multiply
    138.50x = 221.75 × 221.75
  4. Step 4: Simplify right side
    138.50x = 49,173.06
  5. Step 5: Solve for x
    x = 49,173.06/138.50
  6. Step 6: Final answer
    x = 355.04

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.