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Finding the Fourth Proportional to 791.07, 1,186.77 and 271.11

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Solution

The fourth proportional to 791.07, 1,186.77 and 271.11 is: 406.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.07 : 1,186.77 = 271.11 : x
  2. Step 2: Convert to fraction form
    791.07/1,186.77 = 271.11/x
  3. Step 3: Cross multiply
    791.07x = 1,186.77 × 271.11
  4. Step 4: Simplify right side
    791.07x = 321,745.21
  5. Step 5: Solve for x
    x = 321,745.21/791.07
  6. Step 6: Final answer
    x = 406.72

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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.