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Finding the Third Proportional to 121.88 and 163.78

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Solution

The third proportional to 121.88 and 163.78 is: 220.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.88 : 163.78 = 163.78 : x
  2. Step 2: Convert to fraction form
    121.88/163.78 = 163.78/x
  3. Step 3: Cross multiply
    121.88x = 163.78 × 163.78
  4. Step 4: Simplify right side
    121.88x = 26,824.30
  5. Step 5: Solve for x
    x = 26,824.30/121.88
  6. Step 6: Final answer
    x = 220.10

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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.