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Finding the Fourth Proportional to 394.79, 591.48 and 221.26

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Solution

The fourth proportional to 394.79, 591.48 and 221.26 is: 331.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.79 : 591.48 = 221.26 : x
  2. Step 2: Convert to fraction form
    394.79/591.48 = 221.26/x
  3. Step 3: Cross multiply
    394.79x = 591.48 × 221.26
  4. Step 4: Simplify right side
    394.79x = 130,867.91
  5. Step 5: Solve for x
    x = 130,867.91/394.79
  6. Step 6: Final answer
    x = 331.49

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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.