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Finding the Fourth Proportional to 1,072.73, 1,481.21 and 823.66

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Solution

The fourth proportional to 1,072.73, 1,481.21 and 823.66 is: 1,137.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.73 : 1,481.21 = 823.66 : x
  2. Step 2: Convert to fraction form
    1,072.73/1,481.21 = 823.66/x
  3. Step 3: Cross multiply
    1,072.73x = 1,481.21 × 823.66
  4. Step 4: Simplify right side
    1,072.73x = 1,220,001.90
  5. Step 5: Solve for x
    x = 1,220,001.90/1,072.73
  6. Step 6: Final answer
    x = 1,137.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.