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Finding the Fourth Proportional to 911.22, 1,366.89 and 424.41

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Solution

The fourth proportional to 911.22, 1,366.89 and 424.41 is: 636.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.22 : 1,366.89 = 424.41 : x
  2. Step 2: Convert to fraction form
    911.22/1,366.89 = 424.41/x
  3. Step 3: Cross multiply
    911.22x = 1,366.89 × 424.41
  4. Step 4: Simplify right side
    911.22x = 580,121.78
  5. Step 5: Solve for x
    x = 580,121.78/911.22
  6. Step 6: Final answer
    x = 636.64

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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.