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Finding the Fourth Proportional to 791.40, 1,187.11 and 519.22

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Solution

The fourth proportional to 791.40, 1,187.11 and 519.22 is: 778.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.40 : 1,187.11 = 519.22 : x
  2. Step 2: Convert to fraction form
    791.40/1,187.11 = 519.22/x
  3. Step 3: Cross multiply
    791.40x = 1,187.11 × 519.22
  4. Step 4: Simplify right side
    791.40x = 616,363.79
  5. Step 5: Solve for x
    x = 616,363.79/791.40
  6. Step 6: Final answer
    x = 778.82

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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.