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Finding the Fourth Proportional to 1,338.12, 2,007.79 and 791.37

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Solution

The fourth proportional to 1,338.12, 2,007.79 and 791.37 is: 1,187.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.12 : 2,007.79 = 791.37 : x
  2. Step 2: Convert to fraction form
    1,338.12/2,007.79 = 791.37/x
  3. Step 3: Cross multiply
    1,338.12x = 2,007.79 × 791.37
  4. Step 4: Simplify right side
    1,338.12x = 1,588,902.79
  5. Step 5: Solve for x
    x = 1,588,902.79/1,338.12
  6. Step 6: Final answer
    x = 1,187.41

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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.