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Finding the Fourth Proportional to 791.94, 1,092.68 and 493.42

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Solution

The fourth proportional to 791.94, 1,092.68 and 493.42 is: 680.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.94 : 1,092.68 = 493.42 : x
  2. Step 2: Convert to fraction form
    791.94/1,092.68 = 493.42/x
  3. Step 3: Cross multiply
    791.94x = 1,092.68 × 493.42
  4. Step 4: Simplify right side
    791.94x = 539,144.97
  5. Step 5: Solve for x
    x = 539,144.97/791.94
  6. Step 6: Final answer
    x = 680.79

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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.