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Finding the Fourth Proportional to 219.96, 329.99 and 128.73

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Solution

The fourth proportional to 219.96, 329.99 and 128.73 is: 193.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.96 : 329.99 = 128.73 : x
  2. Step 2: Convert to fraction form
    219.96/329.99 = 128.73/x
  3. Step 3: Cross multiply
    219.96x = 329.99 × 128.73
  4. Step 4: Simplify right side
    219.96x = 42,479.61
  5. Step 5: Solve for x
    x = 42,479.61/219.96
  6. Step 6: Final answer
    x = 193.13

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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.