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Finding the Third Proportional to 396 and 695.25

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Solution

The third proportional to 396 and 695.25 is: 1,220.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    396 : 695.25 = 695.25 : x
  2. Step 2: Convert to fraction form
    396/695.25 = 695.25/x
  3. Step 3: Cross multiply
    396x = 695.25 × 695.25
  4. Step 4: Simplify right side
    396x = 483,372.56
  5. Step 5: Solve for x
    x = 483,372.56/396
  6. Step 6: Final answer
    x = 1,220.64

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Why These Related Problems?

These problems maintain the same ratio (1.76) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.