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Finding the Fourth Proportional to 394.28, 591.56 and 221.15

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Solution

The fourth proportional to 394.28, 591.56 and 221.15 is: 331.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.28 : 591.56 = 221.15 : x
  2. Step 2: Convert to fraction form
    394.28/591.56 = 221.15/x
  3. Step 3: Cross multiply
    394.28x = 591.56 × 221.15
  4. Step 4: Simplify right side
    394.28x = 130,819.43
  5. Step 5: Solve for x
    x = 130,819.43/394.28
  6. Step 6: Final answer
    x = 331.80

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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.