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Finding the Fourth Proportional to 819.39, 1,129.97 and 622.56

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Solution

The fourth proportional to 819.39, 1,129.97 and 622.56 is: 858.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.39 : 1,129.97 = 622.56 : x
  2. Step 2: Convert to fraction form
    819.39/1,129.97 = 622.56/x
  3. Step 3: Cross multiply
    819.39x = 1,129.97 × 622.56
  4. Step 4: Simplify right side
    819.39x = 703,474.12
  5. Step 5: Solve for x
    x = 703,474.12/819.39
  6. Step 6: Final answer
    x = 858.53

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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.