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Finding the Fourth Proportional to 219.76, 329.48 and 128.44

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Solution

The fourth proportional to 219.76, 329.48 and 128.44 is: 192.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.76 : 329.48 = 128.44 : x
  2. Step 2: Convert to fraction form
    219.76/329.48 = 128.44/x
  3. Step 3: Cross multiply
    219.76x = 329.48 × 128.44
  4. Step 4: Simplify right side
    219.76x = 42,318.41
  5. Step 5: Solve for x
    x = 42,318.41/219.76
  6. Step 6: Final answer
    x = 192.57

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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.