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Finding the Third Proportional to 172.75 and 191.50

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Solution

The third proportional to 172.75 and 191.50 is: 212.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.75 : 191.50 = 191.50 : x
  2. Step 2: Convert to fraction form
    172.75/191.50 = 191.50/x
  3. Step 3: Cross multiply
    172.75x = 191.50 × 191.50
  4. Step 4: Simplify right side
    172.75x = 36,672.25
  5. Step 5: Solve for x
    x = 36,672.25/172.75
  6. Step 6: Final answer
    x = 212.29

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.