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Finding the Third Proportional to 220.75 and 261.25

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Solution

The third proportional to 220.75 and 261.25 is: 309.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.75 : 261.25 = 261.25 : x
  2. Step 2: Convert to fraction form
    220.75/261.25 = 261.25/x
  3. Step 3: Cross multiply
    220.75x = 261.25 × 261.25
  4. Step 4: Simplify right side
    220.75x = 68,251.56
  5. Step 5: Solve for x
    x = 68,251.56/220.75
  6. Step 6: Final answer
    x = 309.18

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.