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Finding the Fourth Proportional to 329.62, 455.08 and 219.20

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Solution

The fourth proportional to 329.62, 455.08 and 219.20 is: 302.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.62 : 455.08 = 219.20 : x
  2. Step 2: Convert to fraction form
    329.62/455.08 = 219.20/x
  3. Step 3: Cross multiply
    329.62x = 455.08 × 219.20
  4. Step 4: Simplify right side
    329.62x = 99,753.54
  5. Step 5: Solve for x
    x = 99,753.54/329.62
  6. Step 6: Final answer
    x = 302.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.