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Finding the Third Proportional to 138.06 and 219.75

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Solution

The third proportional to 138.06 and 219.75 is: 349.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.06 : 219.75 = 219.75 : x
  2. Step 2: Convert to fraction form
    138.06/219.75 = 219.75/x
  3. Step 3: Cross multiply
    138.06x = 219.75 × 219.75
  4. Step 4: Simplify right side
    138.06x = 48,290.06
  5. Step 5: Solve for x
    x = 48,290.06/138.06
  6. Step 6: Final answer
    x = 349.77

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.