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Finding the Fourth Proportional to 812.46, 1,120.31 and 550.02

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Solution

The fourth proportional to 812.46, 1,120.31 and 550.02 is: 758.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.46 : 1,120.31 = 550.02 : x
  2. Step 2: Convert to fraction form
    812.46/1,120.31 = 550.02/x
  3. Step 3: Cross multiply
    812.46x = 1,120.31 × 550.02
  4. Step 4: Simplify right side
    812.46x = 616,190.16
  5. Step 5: Solve for x
    x = 616,190.16/812.46
  6. Step 6: Final answer
    x = 758.43

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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.