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Finding the Fourth Proportional to 791.33, 1,187.14 and 328.87

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Solution

The fourth proportional to 791.33, 1,187.14 and 328.87 is: 493.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.33 : 1,187.14 = 328.87 : x
  2. Step 2: Convert to fraction form
    791.33/1,187.14 = 328.87/x
  3. Step 3: Cross multiply
    791.33x = 1,187.14 × 328.87
  4. Step 4: Simplify right side
    791.33x = 390,414.73
  5. Step 5: Solve for x
    x = 390,414.73/791.33
  6. Step 6: Final answer
    x = 493.37

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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.