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Finding the Third Proportional to 328.78 and 447.75

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Solution

The third proportional to 328.78 and 447.75 is: 609.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.78 : 447.75 = 447.75 : x
  2. Step 2: Convert to fraction form
    328.78/447.75 = 447.75/x
  3. Step 3: Cross multiply
    328.78x = 447.75 × 447.75
  4. Step 4: Simplify right side
    328.78x = 200,480.06
  5. Step 5: Solve for x
    x = 200,480.06/328.78
  6. Step 6: Final answer
    x = 609.77

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.