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Finding the Fourth Proportional to 329.52, 490.86 and 311.28

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Solution

The fourth proportional to 329.52, 490.86 and 311.28 is: 463.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.52 : 490.86 = 311.28 : x
  2. Step 2: Convert to fraction form
    329.52/490.86 = 311.28/x
  3. Step 3: Cross multiply
    329.52x = 490.86 × 311.28
  4. Step 4: Simplify right side
    329.52x = 152,794.90
  5. Step 5: Solve for x
    x = 152,794.90/329.52
  6. Step 6: Final answer
    x = 463.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.