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Finding the Fourth Proportional to 393.20, 589.34 and 219.78

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Solution

The fourth proportional to 393.20, 589.34 and 219.78 is: 329.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.20 : 589.34 = 219.78 : x
  2. Step 2: Convert to fraction form
    393.20/589.34 = 219.78/x
  3. Step 3: Cross multiply
    393.20x = 589.34 × 219.78
  4. Step 4: Simplify right side
    393.20x = 129,525.15
  5. Step 5: Solve for x
    x = 129,525.15/393.20
  6. Step 6: Final answer
    x = 329.41

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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.