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Finding the Fourth Proportional to 911.39, 1,367.21 and 449.69

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Solution

The fourth proportional to 911.39, 1,367.21 and 449.69 is: 674.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.39 : 1,367.21 = 449.69 : x
  2. Step 2: Convert to fraction form
    911.39/1,367.21 = 449.69/x
  3. Step 3: Cross multiply
    911.39x = 1,367.21 × 449.69
  4. Step 4: Simplify right side
    911.39x = 614,814.95
  5. Step 5: Solve for x
    x = 614,814.95/911.39
  6. Step 6: Final answer
    x = 674.59

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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.