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Finding the Third Proportional to 206.50 and 396.50

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Solution

The third proportional to 206.50 and 396.50 is: 761.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.50 : 396.50 = 396.50 : x
  2. Step 2: Convert to fraction form
    206.50/396.50 = 396.50/x
  3. Step 3: Cross multiply
    206.50x = 396.50 × 396.50
  4. Step 4: Simplify right side
    206.50x = 157,212.25
  5. Step 5: Solve for x
    x = 157,212.25/206.50
  6. Step 6: Final answer
    x = 761.32

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Why These Related Problems?

These problems maintain the same ratio (1.92) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.