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Finding the Fourth Proportional to 639.17, 958.74 and 331.62

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Solution

The fourth proportional to 639.17, 958.74 and 331.62 is: 497.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.17 : 958.74 = 331.62 : x
  2. Step 2: Convert to fraction form
    639.17/958.74 = 331.62/x
  3. Step 3: Cross multiply
    639.17x = 958.74 × 331.62
  4. Step 4: Simplify right side
    639.17x = 317,935.22
  5. Step 5: Solve for x
    x = 317,935.22/639.17
  6. Step 6: Final answer
    x = 497.42

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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.