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Finding the Fourth Proportional to 791.06, 1,185.75 and 399.87

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Solution

The fourth proportional to 791.06, 1,185.75 and 399.87 is: 599.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.06 : 1,185.75 = 399.87 : x
  2. Step 2: Convert to fraction form
    791.06/1,185.75 = 399.87/x
  3. Step 3: Cross multiply
    791.06x = 1,185.75 × 399.87
  4. Step 4: Simplify right side
    791.06x = 474,145.85
  5. Step 5: Solve for x
    x = 474,145.85/791.06
  6. Step 6: Final answer
    x = 599.38

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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.