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Finding the Third Proportional to 212.75 and 382.75

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Solution

The third proportional to 212.75 and 382.75 is: 688.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.75 : 382.75 = 382.75 : x
  2. Step 2: Convert to fraction form
    212.75/382.75 = 382.75/x
  3. Step 3: Cross multiply
    212.75x = 382.75 × 382.75
  4. Step 4: Simplify right side
    212.75x = 146,497.56
  5. Step 5: Solve for x
    x = 146,497.56/212.75
  6. Step 6: Final answer
    x = 688.59

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.