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Finding the Fourth Proportional to 411.92, 617.30 and 320.18

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Solution

The fourth proportional to 411.92, 617.30 and 320.18 is: 479.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.92 : 617.30 = 320.18 : x
  2. Step 2: Convert to fraction form
    411.92/617.30 = 320.18/x
  3. Step 3: Cross multiply
    411.92x = 617.30 × 320.18
  4. Step 4: Simplify right side
    411.92x = 197,647.11
  5. Step 5: Solve for x
    x = 197,647.11/411.92
  6. Step 6: Final answer
    x = 479.82

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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.