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Finding the Third Proportional to 138.75 and 220.75

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Solution

The third proportional to 138.75 and 220.75 is: 351.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.75 : 220.75 = 220.75 : x
  2. Step 2: Convert to fraction form
    138.75/220.75 = 220.75/x
  3. Step 3: Cross multiply
    138.75x = 220.75 × 220.75
  4. Step 4: Simplify right side
    138.75x = 48,730.56
  5. Step 5: Solve for x
    x = 48,730.56/138.75
  6. Step 6: Final answer
    x = 351.21

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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.