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Finding the Fourth Proportional to 327.28, 491.16 and 219.08

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Solution

The fourth proportional to 327.28, 491.16 and 219.08 is: 328.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.28 : 491.16 = 219.08 : x
  2. Step 2: Convert to fraction form
    327.28/491.16 = 219.08/x
  3. Step 3: Cross multiply
    327.28x = 491.16 × 219.08
  4. Step 4: Simplify right side
    327.28x = 107,603.33
  5. Step 5: Solve for x
    x = 107,603.33/327.28
  6. Step 6: Final answer
    x = 328.78

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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.