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Finding the Fourth Proportional to 801.34, 1,105.77 and 447.20

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Solution

The fourth proportional to 801.34, 1,105.77 and 447.20 is: 617.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.34 : 1,105.77 = 447.20 : x
  2. Step 2: Convert to fraction form
    801.34/1,105.77 = 447.20/x
  3. Step 3: Cross multiply
    801.34x = 1,105.77 × 447.20
  4. Step 4: Simplify right side
    801.34x = 494,494.82
  5. Step 5: Solve for x
    x = 494,494.82/801.34
  6. Step 6: Final answer
    x = 617.09

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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.