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Finding the Fourth Proportional to 219.54, 329.31 and 57.21

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Solution

The fourth proportional to 219.54, 329.31 and 57.21 is: 85.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.54 : 329.31 = 57.21 : x
  2. Step 2: Convert to fraction form
    219.54/329.31 = 57.21/x
  3. Step 3: Cross multiply
    219.54x = 329.31 × 57.21
  4. Step 4: Simplify right side
    219.54x = 18,839.83
  5. Step 5: Solve for x
    x = 18,839.83/219.54
  6. Step 6: Final answer
    x = 85.82

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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.