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Finding the Third Proportional to 396.56 and 620.16

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Solution

The third proportional to 396.56 and 620.16 is: 969.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.56 : 620.16 = 620.16 : x
  2. Step 2: Convert to fraction form
    396.56/620.16 = 620.16/x
  3. Step 3: Cross multiply
    396.56x = 620.16 × 620.16
  4. Step 4: Simplify right side
    396.56x = 384,593.77
  5. Step 5: Solve for x
    x = 384,593.77/396.56
  6. Step 6: Final answer
    x = 969.82

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.