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Finding the Fourth Proportional to 411.07, 616.14 and 205.81

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Solution

The fourth proportional to 411.07, 616.14 and 205.81 is: 308.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.07 : 616.14 = 205.81 : x
  2. Step 2: Convert to fraction form
    411.07/616.14 = 205.81/x
  3. Step 3: Cross multiply
    411.07x = 616.14 × 205.81
  4. Step 4: Simplify right side
    411.07x = 126,804.69
  5. Step 5: Solve for x
    x = 126,804.69/411.07
  6. Step 6: Final answer
    x = 308.48

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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.