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Finding the Fourth Proportional to 639.22, 958.22 and 330.38

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Solution

The fourth proportional to 639.22, 958.22 and 330.38 is: 495.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.22 : 958.22 = 330.38 : x
  2. Step 2: Convert to fraction form
    639.22/958.22 = 330.38/x
  3. Step 3: Cross multiply
    639.22x = 958.22 × 330.38
  4. Step 4: Simplify right side
    639.22x = 316,576.72
  5. Step 5: Solve for x
    x = 316,576.72/639.22
  6. Step 6: Final answer
    x = 495.25

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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.