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Finding the Fourth Proportional to 219.97, 330.09 and 128.84

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Solution

The fourth proportional to 219.97, 330.09 and 128.84 is: 193.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.97 : 330.09 = 128.84 : x
  2. Step 2: Convert to fraction form
    219.97/330.09 = 128.84/x
  3. Step 3: Cross multiply
    219.97x = 330.09 × 128.84
  4. Step 4: Simplify right side
    219.97x = 42,529.62
  5. Step 5: Solve for x
    x = 42,529.62/219.97
  6. Step 6: Final answer
    x = 193.35

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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.