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Finding the Fourth Proportional to 791.31, 1,092.39 and 496.74

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Solution

The fourth proportional to 791.31, 1,092.39 and 496.74 is: 685.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.31 : 1,092.39 = 496.74 : x
  2. Step 2: Convert to fraction form
    791.31/1,092.39 = 496.74/x
  3. Step 3: Cross multiply
    791.31x = 1,092.39 × 496.74
  4. Step 4: Simplify right side
    791.31x = 542,633.81
  5. Step 5: Solve for x
    x = 542,633.81/791.31
  6. Step 6: Final answer
    x = 685.74

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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.