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Finding the Fourth Proportional to 639.31, 958.15 and 292.83

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Solution

The fourth proportional to 639.31, 958.15 and 292.83 is: 438.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.31 : 958.15 = 292.83 : x
  2. Step 2: Convert to fraction form
    639.31/958.15 = 292.83/x
  3. Step 3: Cross multiply
    639.31x = 958.15 × 292.83
  4. Step 4: Simplify right side
    639.31x = 280,573.60
  5. Step 5: Solve for x
    x = 280,573.60/639.31
  6. Step 6: Final answer
    x = 438.87

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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.