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Finding the Fourth Proportional to 812.78, 1,121.62 and 481.18

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Solution

The fourth proportional to 812.78, 1,121.62 and 481.18 is: 664.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.78 : 1,121.62 = 481.18 : x
  2. Step 2: Convert to fraction form
    812.78/1,121.62 = 481.18/x
  3. Step 3: Cross multiply
    812.78x = 1,121.62 × 481.18
  4. Step 4: Simplify right side
    812.78x = 539,701.11
  5. Step 5: Solve for x
    x = 539,701.11/812.78
  6. Step 6: Final answer
    x = 664.02

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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.