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Finding the Fourth Proportional to 394.88, 592.72 and 212.42

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Solution

The fourth proportional to 394.88, 592.72 and 212.42 is: 318.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.88 : 592.72 = 212.42 : x
  2. Step 2: Convert to fraction form
    394.88/592.72 = 212.42/x
  3. Step 3: Cross multiply
    394.88x = 592.72 × 212.42
  4. Step 4: Simplify right side
    394.88x = 125,906.53
  5. Step 5: Solve for x
    x = 125,906.53/394.88
  6. Step 6: Final answer
    x = 318.85

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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.