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Finding the Fourth Proportional to 791.14, 1,186.79 and 271.19

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Solution

The fourth proportional to 791.14, 1,186.79 and 271.19 is: 406.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.14 : 1,186.79 = 271.19 : x
  2. Step 2: Convert to fraction form
    791.14/1,186.79 = 271.19/x
  3. Step 3: Cross multiply
    791.14x = 1,186.79 × 271.19
  4. Step 4: Simplify right side
    791.14x = 321,844.22
  5. Step 5: Solve for x
    x = 321,844.22/791.14
  6. Step 6: Final answer
    x = 406.81

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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.