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Finding the Third Proportional to 231 and 396

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Solution

The third proportional to 231 and 396 is: 678.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    231 : 396 = 396 : x
  2. Step 2: Convert to fraction form
    231/396 = 396/x
  3. Step 3: Cross multiply
    231x = 396 × 396
  4. Step 4: Simplify right side
    231x = 156,816
  5. Step 5: Solve for x
    x = 156,816/231
  6. Step 6: Final answer
    x = 678.86

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Why These Related Problems?

These problems maintain the same ratio (1.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.