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Finding the Third Proportional to 212.25 and 286.38

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Solution

The third proportional to 212.25 and 286.38 is: 386.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.25 : 286.38 = 286.38 : x
  2. Step 2: Convert to fraction form
    212.25/286.38 = 286.38/x
  3. Step 3: Cross multiply
    212.25x = 286.38 × 286.38
  4. Step 4: Simplify right side
    212.25x = 82,010.64
  5. Step 5: Solve for x
    x = 82,010.64/212.25
  6. Step 6: Final answer
    x = 386.39

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.