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Finding the Fourth Proportional to 791.41, 1,186.78 and 271.30

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Solution

The fourth proportional to 791.41, 1,186.78 and 271.30 is: 406.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.41 : 1,186.78 = 271.30 : x
  2. Step 2: Convert to fraction form
    791.41/1,186.78 = 271.30/x
  3. Step 3: Cross multiply
    791.41x = 1,186.78 × 271.30
  4. Step 4: Simplify right side
    791.41x = 321,973.41
  5. Step 5: Solve for x
    x = 321,973.41/791.41
  6. Step 6: Final answer
    x = 406.84

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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.