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Finding the Fourth Proportional to 1,286.67, 1,930.07 and 409.11

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Solution

The fourth proportional to 1,286.67, 1,930.07 and 409.11 is: 613.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.67 : 1,930.07 = 409.11 : x
  2. Step 2: Convert to fraction form
    1,286.67/1,930.07 = 409.11/x
  3. Step 3: Cross multiply
    1,286.67x = 1,930.07 × 409.11
  4. Step 4: Simplify right side
    1,286.67x = 789,610.94
  5. Step 5: Solve for x
    x = 789,610.94/1,286.67
  6. Step 6: Final answer
    x = 613.69

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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.