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Finding the Fourth Proportional to 219.79, 329.57 and 80.96

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Solution

The fourth proportional to 219.79, 329.57 and 80.96 is: 121.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.79 : 329.57 = 80.96 : x
  2. Step 2: Convert to fraction form
    219.79/329.57 = 80.96/x
  3. Step 3: Cross multiply
    219.79x = 329.57 × 80.96
  4. Step 4: Simplify right side
    219.79x = 26,681.99
  5. Step 5: Solve for x
    x = 26,681.99/219.79
  6. Step 6: Final answer
    x = 121.40

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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.