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Finding the Fourth Proportional to 791.39, 1,187.26 and 271.42

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Solution

The fourth proportional to 791.39, 1,187.26 and 271.42 is: 407.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.39 : 1,187.26 = 271.42 : x
  2. Step 2: Convert to fraction form
    791.39/1,187.26 = 271.42/x
  3. Step 3: Cross multiply
    791.39x = 1,187.26 × 271.42
  4. Step 4: Simplify right side
    791.39x = 322,242.46
  5. Step 5: Solve for x
    x = 322,242.46/791.39
  6. Step 6: Final answer
    x = 407.18

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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.