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Finding the Fourth Proportional to 2,640.33, 3,959.64 and 791.10

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Solution

The fourth proportional to 2,640.33, 3,959.64 and 791.10 is: 1,186.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.33 : 3,959.64 = 791.10 : x
  2. Step 2: Convert to fraction form
    2,640.33/3,959.64 = 791.10/x
  3. Step 3: Cross multiply
    2,640.33x = 3,959.64 × 791.10
  4. Step 4: Simplify right side
    2,640.33x = 3,132,471.20
  5. Step 5: Solve for x
    x = 3,132,471.20/2,640.33
  6. Step 6: Final answer
    x = 1,186.39

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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.