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Finding the Fourth Proportional to 393.21, 589.42 and 219.96

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Solution

The fourth proportional to 393.21, 589.42 and 219.96 is: 329.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.21 : 589.42 = 219.96 : x
  2. Step 2: Convert to fraction form
    393.21/589.42 = 219.96/x
  3. Step 3: Cross multiply
    393.21x = 589.42 × 219.96
  4. Step 4: Simplify right side
    393.21x = 129,648.27
  5. Step 5: Solve for x
    x = 129,648.27/393.21
  6. Step 6: Final answer
    x = 329.72

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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.