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Finding the Third Proportional to 328.75 and 490.38

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Solution

The third proportional to 328.75 and 490.38 is: 731.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.75 : 490.38 = 490.38 : x
  2. Step 2: Convert to fraction form
    328.75/490.38 = 490.38/x
  3. Step 3: Cross multiply
    328.75x = 490.38 × 490.38
  4. Step 4: Simplify right side
    328.75x = 240,467.64
  5. Step 5: Solve for x
    x = 240,467.64/328.75
  6. Step 6: Final answer
    x = 731.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.