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Finding the Fourth Proportional to 408.60, 611.80 and 271.28

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Solution

The fourth proportional to 408.60, 611.80 and 271.28 is: 406.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.60 : 611.80 = 271.28 : x
  2. Step 2: Convert to fraction form
    408.60/611.80 = 271.28/x
  3. Step 3: Cross multiply
    408.60x = 611.80 × 271.28
  4. Step 4: Simplify right side
    408.60x = 165,969.10
  5. Step 5: Solve for x
    x = 165,969.10/408.60
  6. Step 6: Final answer
    x = 406.19

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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.