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Finding the Fourth Proportional to 394.43, 591.64 and 211.91

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Solution

The fourth proportional to 394.43, 591.64 and 211.91 is: 317.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.43 : 591.64 = 211.91 : x
  2. Step 2: Convert to fraction form
    394.43/591.64 = 211.91/x
  3. Step 3: Cross multiply
    394.43x = 591.64 × 211.91
  4. Step 4: Simplify right side
    394.43x = 125,370.94
  5. Step 5: Solve for x
    x = 125,370.94/394.43
  6. Step 6: Final answer
    x = 317.86

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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.