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Finding the Fourth Proportional to 411.60, 617.40 and 330.60

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Solution

The fourth proportional to 411.60, 617.40 and 330.60 is: 495.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.60 : 617.40 = 330.60 : x
  2. Step 2: Convert to fraction form
    411.60/617.40 = 330.60/x
  3. Step 3: Cross multiply
    411.60x = 617.40 × 330.60
  4. Step 4: Simplify right side
    411.60x = 204,112.44
  5. Step 5: Solve for x
    x = 204,112.44/411.60
  6. Step 6: Final answer
    x = 495.90

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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.