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Finding the Fourth Proportional to 801.39, 1,105.92 and 447.31

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Solution

The fourth proportional to 801.39, 1,105.92 and 447.31 is: 617.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.39 : 1,105.92 = 447.31 : x
  2. Step 2: Convert to fraction form
    801.39/1,105.92 = 447.31/x
  3. Step 3: Cross multiply
    801.39x = 1,105.92 × 447.31
  4. Step 4: Simplify right side
    801.39x = 494,686.31
  5. Step 5: Solve for x
    x = 494,686.31/801.39
  6. Step 6: Final answer
    x = 617.29

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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.