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Finding the Fourth Proportional to 639.06, 956.96 and 394.84

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Solution

The fourth proportional to 639.06, 956.96 and 394.84 is: 591.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.06 : 956.96 = 394.84 : x
  2. Step 2: Convert to fraction form
    639.06/956.96 = 394.84/x
  3. Step 3: Cross multiply
    639.06x = 956.96 × 394.84
  4. Step 4: Simplify right side
    639.06x = 377,846.09
  5. Step 5: Solve for x
    x = 377,846.09/639.06
  6. Step 6: Final answer
    x = 591.25

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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.