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Finding the Third Proportional to 155.25 and 319.78

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Solution

The third proportional to 155.25 and 319.78 is: 658.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.25 : 319.78 = 319.78 : x
  2. Step 2: Convert to fraction form
    155.25/319.78 = 319.78/x
  3. Step 3: Cross multiply
    155.25x = 319.78 × 319.78
  4. Step 4: Simplify right side
    155.25x = 102,260.05
  5. Step 5: Solve for x
    x = 102,260.05/155.25
  6. Step 6: Final answer
    x = 658.68

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.