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Finding the Fourth Proportional to 393.46, 589.68 and 220.05

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Solution

The fourth proportional to 393.46, 589.68 and 220.05 is: 329.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.46 : 589.68 = 220.05 : x
  2. Step 2: Convert to fraction form
    393.46/589.68 = 220.05/x
  3. Step 3: Cross multiply
    393.46x = 589.68 × 220.05
  4. Step 4: Simplify right side
    393.46x = 129,759.08
  5. Step 5: Solve for x
    x = 129,759.08/393.46
  6. Step 6: Final answer
    x = 329.79

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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.