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Finding the Fourth Proportional to 791.11, 1,186.76 and 271.18

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Solution

The fourth proportional to 791.11, 1,186.76 and 271.18 is: 406.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.11 : 1,186.76 = 271.18 : x
  2. Step 2: Convert to fraction form
    791.11/1,186.76 = 271.18/x
  3. Step 3: Cross multiply
    791.11x = 1,186.76 × 271.18
  4. Step 4: Simplify right side
    791.11x = 321,825.58
  5. Step 5: Solve for x
    x = 321,825.58/791.11
  6. Step 6: Final answer
    x = 406.80

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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.