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Finding the Fourth Proportional to 639.39, 958.25 and 254.19

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Solution

The fourth proportional to 639.39, 958.25 and 254.19 is: 380.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.39 : 958.25 = 254.19 : x
  2. Step 2: Convert to fraction form
    639.39/958.25 = 254.19/x
  3. Step 3: Cross multiply
    639.39x = 958.25 × 254.19
  4. Step 4: Simplify right side
    639.39x = 243,576.30
  5. Step 5: Solve for x
    x = 243,576.30/639.39
  6. Step 6: Final answer
    x = 380.95

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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.