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Finding the Third Proportional to 218.53 and 319.78

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Solution

The third proportional to 218.53 and 319.78 is: 467.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.53 : 319.78 = 319.78 : x
  2. Step 2: Convert to fraction form
    218.53/319.78 = 319.78/x
  3. Step 3: Cross multiply
    218.53x = 319.78 × 319.78
  4. Step 4: Simplify right side
    218.53x = 102,260.05
  5. Step 5: Solve for x
    x = 102,260.05/218.53
  6. Step 6: Final answer
    x = 467.94

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.