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Finding the Fourth Proportional to 411.80, 617.09 and 267.21

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Solution

The fourth proportional to 411.80, 617.09 and 267.21 is: 400.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.80 : 617.09 = 267.21 : x
  2. Step 2: Convert to fraction form
    411.80/617.09 = 267.21/x
  3. Step 3: Cross multiply
    411.80x = 617.09 × 267.21
  4. Step 4: Simplify right side
    411.80x = 164,891.28
  5. Step 5: Solve for x
    x = 164,891.28/411.80
  6. Step 6: Final answer
    x = 400.42

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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.