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Finding the Fourth Proportional to 791.14, 1,091.31 and 495.89

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Solution

The fourth proportional to 791.14, 1,091.31 and 495.89 is: 684.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.14 : 1,091.31 = 495.89 : x
  2. Step 2: Convert to fraction form
    791.14/1,091.31 = 495.89/x
  3. Step 3: Cross multiply
    791.14x = 1,091.31 × 495.89
  4. Step 4: Simplify right side
    791.14x = 541,169.72
  5. Step 5: Solve for x
    x = 541,169.72/791.14
  6. Step 6: Final answer
    x = 684.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.