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Finding the Fourth Proportional to 791.15, 1,091.61 and 459.45

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Solution

The fourth proportional to 791.15, 1,091.61 and 459.45 is: 633.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.15 : 1,091.61 = 459.45 : x
  2. Step 2: Convert to fraction form
    791.15/1,091.61 = 459.45/x
  3. Step 3: Cross multiply
    791.15x = 1,091.61 × 459.45
  4. Step 4: Simplify right side
    791.15x = 501,540.21
  5. Step 5: Solve for x
    x = 501,540.21/791.15
  6. Step 6: Final answer
    x = 633.94

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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.