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Finding the Third Proportional to 121.13 and 171.38

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Solution

The third proportional to 121.13 and 171.38 is: 242.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.13 : 171.38 = 171.38 : x
  2. Step 2: Convert to fraction form
    121.13/171.38 = 171.38/x
  3. Step 3: Cross multiply
    121.13x = 171.38 × 171.38
  4. Step 4: Simplify right side
    121.13x = 29,369.39
  5. Step 5: Solve for x
    x = 29,369.39/121.13
  6. Step 6: Final answer
    x = 242.47

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.