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Finding the Fourth Proportional to 892.18, 1,338.78 and 481.31

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Solution

The fourth proportional to 892.18, 1,338.78 and 481.31 is: 722.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.18 : 1,338.78 = 481.31 : x
  2. Step 2: Convert to fraction form
    892.18/1,338.78 = 481.31/x
  3. Step 3: Cross multiply
    892.18x = 1,338.78 × 481.31
  4. Step 4: Simplify right side
    892.18x = 644,359.10
  5. Step 5: Solve for x
    x = 644,359.10/892.18
  6. Step 6: Final answer
    x = 722.23

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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.