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Finding the Third Proportional to 328.78 and 418.78

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Solution

The third proportional to 328.78 and 418.78 is: 533.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.78 : 418.78 = 418.78 : x
  2. Step 2: Convert to fraction form
    328.78/418.78 = 418.78/x
  3. Step 3: Cross multiply
    328.78x = 418.78 × 418.78
  4. Step 4: Simplify right side
    328.78x = 175,377.74
  5. Step 5: Solve for x
    x = 175,377.74/328.78
  6. Step 6: Final answer
    x = 533.42

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.