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Finding the Third Proportional to 121.75 and 162.75

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Solution

The third proportional to 121.75 and 162.75 is: 217.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.75 : 162.75 = 162.75 : x
  2. Step 2: Convert to fraction form
    121.75/162.75 = 162.75/x
  3. Step 3: Cross multiply
    121.75x = 162.75 × 162.75
  4. Step 4: Simplify right side
    121.75x = 26,487.56
  5. Step 5: Solve for x
    x = 26,487.56/121.75
  6. Step 6: Final answer
    x = 217.56

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.