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Finding the Fourth Proportional to 791.67, 1,187.91 and 426.81

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Solution

The fourth proportional to 791.67, 1,187.91 and 426.81 is: 640.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.67 : 1,187.91 = 426.81 : x
  2. Step 2: Convert to fraction form
    791.67/1,187.91 = 426.81/x
  3. Step 3: Cross multiply
    791.67x = 1,187.91 × 426.81
  4. Step 4: Simplify right side
    791.67x = 507,011.87
  5. Step 5: Solve for x
    x = 507,011.87/791.67
  6. Step 6: Final answer
    x = 640.43

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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.