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Finding the Fourth Proportional to 819.39, 1,221.63 and 727.05

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Solution

The fourth proportional to 819.39, 1,221.63 and 727.05 is: 1,083.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.39 : 1,221.63 = 727.05 : x
  2. Step 2: Convert to fraction form
    819.39/1,221.63 = 727.05/x
  3. Step 3: Cross multiply
    819.39x = 1,221.63 × 727.05
  4. Step 4: Simplify right side
    819.39x = 888,181.22
  5. Step 5: Solve for x
    x = 888,181.22/819.39
  6. Step 6: Final answer
    x = 1,083.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.