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Finding the Fourth Proportional to 2,642.82, 3,964.22 and 911.44

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Solution

The fourth proportional to 2,642.82, 3,964.22 and 911.44 is: 1,367.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,642.82 : 3,964.22 = 911.44 : x
  2. Step 2: Convert to fraction form
    2,642.82/3,964.22 = 911.44/x
  3. Step 3: Cross multiply
    2,642.82x = 3,964.22 × 911.44
  4. Step 4: Simplify right side
    2,642.82x = 3,613,148.68
  5. Step 5: Solve for x
    x = 3,613,148.68/2,642.82
  6. Step 6: Final answer
    x = 1,367.16

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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.