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Finding the Fourth Proportional to 411.38, 616.29 and 205.70

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Solution

The fourth proportional to 411.38, 616.29 and 205.70 is: 308.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.38 : 616.29 = 205.70 : x
  2. Step 2: Convert to fraction form
    411.38/616.29 = 205.70/x
  3. Step 3: Cross multiply
    411.38x = 616.29 × 205.70
  4. Step 4: Simplify right side
    411.38x = 126,772.39
  5. Step 5: Solve for x
    x = 126,772.39/411.38
  6. Step 6: Final answer
    x = 308.17

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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.