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Finding the Fourth Proportional to 819.35, 1,228.78 and 234.31

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Solution

The fourth proportional to 819.35, 1,228.78 and 234.31 is: 351.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.35 : 1,228.78 = 234.31 : x
  2. Step 2: Convert to fraction form
    819.35/1,228.78 = 234.31/x
  3. Step 3: Cross multiply
    819.35x = 1,228.78 × 234.31
  4. Step 4: Simplify right side
    819.35x = 287,915.44
  5. Step 5: Solve for x
    x = 287,915.44/819.35
  6. Step 6: Final answer
    x = 351.39

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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.