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Finding the Fourth Proportional to 640.29, 959.66 and 331.97

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Solution

The fourth proportional to 640.29, 959.66 and 331.97 is: 497.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.29 : 959.66 = 331.97 : x
  2. Step 2: Convert to fraction form
    640.29/959.66 = 331.97/x
  3. Step 3: Cross multiply
    640.29x = 959.66 × 331.97
  4. Step 4: Simplify right side
    640.29x = 318,578.33
  5. Step 5: Solve for x
    x = 318,578.33/640.29
  6. Step 6: Final answer
    x = 497.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.