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Finding the Third Proportional to 121.50 and 171.28

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Solution

The third proportional to 121.50 and 171.28 is: 241.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.50 : 171.28 = 171.28 : x
  2. Step 2: Convert to fraction form
    121.50/171.28 = 171.28/x
  3. Step 3: Cross multiply
    121.50x = 171.28 × 171.28
  4. Step 4: Simplify right side
    121.50x = 29,337.27
  5. Step 5: Solve for x
    x = 29,337.27/121.50
  6. Step 6: Final answer
    x = 241.46

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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.