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Finding the Fourth Proportional to 812.68, 1,121.30 and 550.60

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Solution

The fourth proportional to 812.68, 1,121.30 and 550.60 is: 759.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.68 : 1,121.30 = 550.60 : x
  2. Step 2: Convert to fraction form
    812.68/1,121.30 = 550.60/x
  3. Step 3: Cross multiply
    812.68x = 1,121.30 × 550.60
  4. Step 4: Simplify right side
    812.68x = 617,387.78
  5. Step 5: Solve for x
    x = 617,387.78/812.68
  6. Step 6: Final answer
    x = 759.69

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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.