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Finding the Fourth Proportional to 411.39, 616.30 and 205.72

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Solution

The fourth proportional to 411.39, 616.30 and 205.72 is: 308.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.39 : 616.30 = 205.72 : x
  2. Step 2: Convert to fraction form
    411.39/616.30 = 205.72/x
  3. Step 3: Cross multiply
    411.39x = 616.30 × 205.72
  4. Step 4: Simplify right side
    411.39x = 126,783.18
  5. Step 5: Solve for x
    x = 126,783.18/411.39
  6. Step 6: Final answer
    x = 308.18

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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.