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Finding the Fourth Proportional to 638.25, 956.70 and 329.41

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Solution

The fourth proportional to 638.25, 956.70 and 329.41 is: 493.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.25 : 956.70 = 329.41 : x
  2. Step 2: Convert to fraction form
    638.25/956.70 = 329.41/x
  3. Step 3: Cross multiply
    638.25x = 956.70 × 329.41
  4. Step 4: Simplify right side
    638.25x = 315,146.55
  5. Step 5: Solve for x
    x = 315,146.55/638.25
  6. Step 6: Final answer
    x = 493.77

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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.