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Finding the Fourth Proportional to 791.81, 1,186.95 and 329.91

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Solution

The fourth proportional to 791.81, 1,186.95 and 329.91 is: 494.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.81 : 1,186.95 = 329.91 : x
  2. Step 2: Convert to fraction form
    791.81/1,186.95 = 329.91/x
  3. Step 3: Cross multiply
    791.81x = 1,186.95 × 329.91
  4. Step 4: Simplify right side
    791.81x = 391,583.46
  5. Step 5: Solve for x
    x = 391,583.46/791.81
  6. Step 6: Final answer
    x = 494.54

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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.