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Finding the Fourth Proportional to 791.31, 1,187.39 and 406.56

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Solution

The fourth proportional to 791.31, 1,187.39 and 406.56 is: 610.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.31 : 1,187.39 = 406.56 : x
  2. Step 2: Convert to fraction form
    791.31/1,187.39 = 406.56/x
  3. Step 3: Cross multiply
    791.31x = 1,187.39 × 406.56
  4. Step 4: Simplify right side
    791.31x = 482,745.28
  5. Step 5: Solve for x
    x = 482,745.28/791.31
  6. Step 6: Final answer
    x = 610.06

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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.