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Finding the Fourth Proportional to 639.43, 958.34 and 273.79

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Solution

The fourth proportional to 639.43, 958.34 and 273.79 is: 410.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.43 : 958.34 = 273.79 : x
  2. Step 2: Convert to fraction form
    639.43/958.34 = 273.79/x
  3. Step 3: Cross multiply
    639.43x = 958.34 × 273.79
  4. Step 4: Simplify right side
    639.43x = 262,383.91
  5. Step 5: Solve for x
    x = 262,383.91/639.43
  6. Step 6: Final answer
    x = 410.34

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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.