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Finding the Fourth Proportional to 394.46, 591.96 and 391.42

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Solution

The fourth proportional to 394.46, 591.96 and 391.42 is: 587.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.46 : 591.96 = 391.42 : x
  2. Step 2: Convert to fraction form
    394.46/591.96 = 391.42/x
  3. Step 3: Cross multiply
    394.46x = 591.96 × 391.42
  4. Step 4: Simplify right side
    394.46x = 231,704.98
  5. Step 5: Solve for x
    x = 231,704.98/394.46
  6. Step 6: Final answer
    x = 587.40

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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.