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Finding the Third Proportional to 396.75 and 921.38

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Solution

The third proportional to 396.75 and 921.38 is: 2,139.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.75 : 921.38 = 921.38 : x
  2. Step 2: Convert to fraction form
    396.75/921.38 = 921.38/x
  3. Step 3: Cross multiply
    396.75x = 921.38 × 921.38
  4. Step 4: Simplify right side
    396.75x = 848,931.89
  5. Step 5: Solve for x
    x = 848,931.89/396.75
  6. Step 6: Final answer
    x = 2,139.71

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Why These Related Problems?

These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.