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Finding the Fourth Proportional to 411.20, 617.16 and 218.96

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Solution

The fourth proportional to 411.20, 617.16 and 218.96 is: 328.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.20 : 617.16 = 218.96 : x
  2. Step 2: Convert to fraction form
    411.20/617.16 = 218.96/x
  3. Step 3: Cross multiply
    411.20x = 617.16 × 218.96
  4. Step 4: Simplify right side
    411.20x = 135,133.35
  5. Step 5: Solve for x
    x = 135,133.35/411.20
  6. Step 6: Final answer
    x = 328.63

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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.