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Finding the Third Proportional to 394.38 and 551.38

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Solution

The third proportional to 394.38 and 551.38 is: 770.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.38 : 551.38 = 551.38 : x
  2. Step 2: Convert to fraction form
    394.38/551.38 = 551.38/x
  3. Step 3: Cross multiply
    394.38x = 551.38 × 551.38
  4. Step 4: Simplify right side
    394.38x = 304,014.39
  5. Step 5: Solve for x
    x = 304,014.39/394.38
  6. Step 6: Final answer
    x = 770.88

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.