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Finding the Fourth Proportional to 411.18, 617.19 and 320.88

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Solution

The fourth proportional to 411.18, 617.19 and 320.88 is: 481.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.18 : 617.19 = 320.88 : x
  2. Step 2: Convert to fraction form
    411.18/617.19 = 320.88/x
  3. Step 3: Cross multiply
    411.18x = 617.19 × 320.88
  4. Step 4: Simplify right side
    411.18x = 198,043.93
  5. Step 5: Solve for x
    x = 198,043.93/411.18
  6. Step 6: Final answer
    x = 481.65

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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.