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Finding the Fourth Proportional to 843.40, 1,167.78 and 827.20

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Solution

The fourth proportional to 843.40, 1,167.78 and 827.20 is: 1,145.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.40 : 1,167.78 = 827.20 : x
  2. Step 2: Convert to fraction form
    843.40/1,167.78 = 827.20/x
  3. Step 3: Cross multiply
    843.40x = 1,167.78 × 827.20
  4. Step 4: Simplify right side
    843.40x = 965,987.62
  5. Step 5: Solve for x
    x = 965,987.62/843.40
  6. Step 6: Final answer
    x = 1,145.35

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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.