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Finding the Fourth Proportional to 905.20, 1,249.17 and 512.22

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Solution

The fourth proportional to 905.20, 1,249.17 and 512.22 is: 706.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.20 : 1,249.17 = 512.22 : x
  2. Step 2: Convert to fraction form
    905.20/1,249.17 = 512.22/x
  3. Step 3: Cross multiply
    905.20x = 1,249.17 × 512.22
  4. Step 4: Simplify right side
    905.20x = 639,843.61
  5. Step 5: Solve for x
    x = 639,843.61/905.20
  6. Step 6: Final answer
    x = 706.85

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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.