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Finding the Fourth Proportional to 813.28, 1,121.92 and 481.54

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Solution

The fourth proportional to 813.28, 1,121.92 and 481.54 is: 664.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.28 : 1,121.92 = 481.54 : x
  2. Step 2: Convert to fraction form
    813.28/1,121.92 = 481.54/x
  3. Step 3: Cross multiply
    813.28x = 1,121.92 × 481.54
  4. Step 4: Simplify right side
    813.28x = 540,249.36
  5. Step 5: Solve for x
    x = 540,249.36/813.28
  6. Step 6: Final answer
    x = 664.28

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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.