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Finding the Fourth Proportional to 639.82, 960.34 and 396.82

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Solution

The fourth proportional to 639.82, 960.34 and 396.82 is: 595.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.82 : 960.34 = 396.82 : x
  2. Step 2: Convert to fraction form
    639.82/960.34 = 396.82/x
  3. Step 3: Cross multiply
    639.82x = 960.34 × 396.82
  4. Step 4: Simplify right side
    639.82x = 381,082.12
  5. Step 5: Solve for x
    x = 381,082.12/639.82
  6. Step 6: Final answer
    x = 595.61

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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.