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Finding the Fourth Proportional to 639.01, 958.30 and 330.82

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Solution

The fourth proportional to 639.01, 958.30 and 330.82 is: 496.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.01 : 958.30 = 330.82 : x
  2. Step 2: Convert to fraction form
    639.01/958.30 = 330.82/x
  3. Step 3: Cross multiply
    639.01x = 958.30 × 330.82
  4. Step 4: Simplify right side
    639.01x = 317,024.81
  5. Step 5: Solve for x
    x = 317,024.81/639.01
  6. Step 6: Final answer
    x = 496.12

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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.