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Finding the Fourth Proportional to 819.09, 1,228.62 and 234.15

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Solution

The fourth proportional to 819.09, 1,228.62 and 234.15 is: 351.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.09 : 1,228.62 = 234.15 : x
  2. Step 2: Convert to fraction form
    819.09/1,228.62 = 234.15/x
  3. Step 3: Cross multiply
    819.09x = 1,228.62 × 234.15
  4. Step 4: Simplify right side
    819.09x = 287,681.37
  5. Step 5: Solve for x
    x = 287,681.37/819.09
  6. Step 6: Final answer
    x = 351.22

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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.