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Finding the Fourth Proportional to 394.61, 591.17 and 221.06

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Solution

The fourth proportional to 394.61, 591.17 and 221.06 is: 331.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.61 : 591.17 = 221.06 : x
  2. Step 2: Convert to fraction form
    394.61/591.17 = 221.06/x
  3. Step 3: Cross multiply
    394.61x = 591.17 × 221.06
  4. Step 4: Simplify right side
    394.61x = 130,684.41
  5. Step 5: Solve for x
    x = 130,684.41/394.61
  6. Step 6: Final answer
    x = 331.18

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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.