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Finding the Fourth Proportional to 819.41, 1,228.41 and 664.94

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Solution

The fourth proportional to 819.41, 1,228.41 and 664.94 is: 996.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.41 : 1,228.41 = 664.94 : x
  2. Step 2: Convert to fraction form
    819.41/1,228.41 = 664.94/x
  3. Step 3: Cross multiply
    819.41x = 1,228.41 × 664.94
  4. Step 4: Simplify right side
    819.41x = 816,822.02
  5. Step 5: Solve for x
    x = 816,822.02/819.41
  6. Step 6: Final answer
    x = 996.85

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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.