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Finding the Fourth Proportional to 855.11, 1,282.21 and 443.23

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Solution

The fourth proportional to 855.11, 1,282.21 and 443.23 is: 664.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.11 : 1,282.21 = 443.23 : x
  2. Step 2: Convert to fraction form
    855.11/1,282.21 = 443.23/x
  3. Step 3: Cross multiply
    855.11x = 1,282.21 × 443.23
  4. Step 4: Simplify right side
    855.11x = 568,309.62
  5. Step 5: Solve for x
    x = 568,309.62/855.11
  6. Step 6: Final answer
    x = 664.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.