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Finding the Third Proportional to 396.38 and 818.25

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Solution

The third proportional to 396.38 and 818.25 is: 1,689.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.38 : 818.25 = 818.25 : x
  2. Step 2: Convert to fraction form
    396.38/818.25 = 818.25/x
  3. Step 3: Cross multiply
    396.38x = 818.25 × 818.25
  4. Step 4: Simplify right side
    396.38x = 669,533.06
  5. Step 5: Solve for x
    x = 669,533.06/396.38
  6. Step 6: Final answer
    x = 1,689.14

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.