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Finding the Fourth Proportional to 791.17, 1,186.92 and 271.55

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Solution

The fourth proportional to 791.17, 1,186.92 and 271.55 is: 407.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.17 : 1,186.92 = 271.55 : x
  2. Step 2: Convert to fraction form
    791.17/1,186.92 = 271.55/x
  3. Step 3: Cross multiply
    791.17x = 1,186.92 × 271.55
  4. Step 4: Simplify right side
    791.17x = 322,311.09
  5. Step 5: Solve for x
    x = 322,311.09/791.17
  6. Step 6: Final answer
    x = 407.39

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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.