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Finding the Third Proportional to 81.50 and 172.75

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Solution

The third proportional to 81.50 and 172.75 is: 366.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.50 : 172.75 = 172.75 : x
  2. Step 2: Convert to fraction form
    81.50/172.75 = 172.75/x
  3. Step 3: Cross multiply
    81.50x = 172.75 × 172.75
  4. Step 4: Simplify right side
    81.50x = 29,842.56
  5. Step 5: Solve for x
    x = 29,842.56/81.50
  6. Step 6: Final answer
    x = 366.17

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.