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Finding the Fourth Proportional to 219.55, 329.57 and 111.31

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Solution

The fourth proportional to 219.55, 329.57 and 111.31 is: 167.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.55 : 329.57 = 111.31 : x
  2. Step 2: Convert to fraction form
    219.55/329.57 = 111.31/x
  3. Step 3: Cross multiply
    219.55x = 329.57 × 111.31
  4. Step 4: Simplify right side
    219.55x = 36,684.44
  5. Step 5: Solve for x
    x = 36,684.44/219.55
  6. Step 6: Final answer
    x = 167.09

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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.