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Finding the Fourth Proportional to 639.42, 958.68 and 326.29

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Solution

The fourth proportional to 639.42, 958.68 and 326.29 is: 489.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.42 : 958.68 = 326.29 : x
  2. Step 2: Convert to fraction form
    639.42/958.68 = 326.29/x
  3. Step 3: Cross multiply
    639.42x = 958.68 × 326.29
  4. Step 4: Simplify right side
    639.42x = 312,807.70
  5. Step 5: Solve for x
    x = 312,807.70/639.42
  6. Step 6: Final answer
    x = 489.21

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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.