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Finding the Fourth Proportional to 791.72, 1,187.81 and 426.77

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Solution

The fourth proportional to 791.72, 1,187.81 and 426.77 is: 640.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.72 : 1,187.81 = 426.77 : x
  2. Step 2: Convert to fraction form
    791.72/1,187.81 = 426.77/x
  3. Step 3: Cross multiply
    791.72x = 1,187.81 × 426.77
  4. Step 4: Simplify right side
    791.72x = 506,922.06
  5. Step 5: Solve for x
    x = 506,922.06/791.72
  6. Step 6: Final answer
    x = 640.28

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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.