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Finding the Fourth Proportional to 219.89, 329.85 and 111.65

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Solution

The fourth proportional to 219.89, 329.85 and 111.65 is: 167.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.89 : 329.85 = 111.65 : x
  2. Step 2: Convert to fraction form
    219.89/329.85 = 111.65/x
  3. Step 3: Cross multiply
    219.89x = 329.85 × 111.65
  4. Step 4: Simplify right side
    219.89x = 36,827.75
  5. Step 5: Solve for x
    x = 36,827.75/219.89
  6. Step 6: Final answer
    x = 167.48

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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.