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Finding the Fourth Proportional to 394.85, 592.39 and 212.11

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Solution

The fourth proportional to 394.85, 592.39 and 212.11 is: 318.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.85 : 592.39 = 212.11 : x
  2. Step 2: Convert to fraction form
    394.85/592.39 = 212.11/x
  3. Step 3: Cross multiply
    394.85x = 592.39 × 212.11
  4. Step 4: Simplify right side
    394.85x = 125,651.84
  5. Step 5: Solve for x
    x = 125,651.84/394.85
  6. Step 6: Final answer
    x = 318.23

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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.