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Finding the Fourth Proportional to 791.20, 1,187.70 and 329.32

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Solution

The fourth proportional to 791.20, 1,187.70 and 329.32 is: 494.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.20 : 1,187.70 = 329.32 : x
  2. Step 2: Convert to fraction form
    791.20/1,187.70 = 329.32/x
  3. Step 3: Cross multiply
    791.20x = 1,187.70 × 329.32
  4. Step 4: Simplify right side
    791.20x = 391,133.36
  5. Step 5: Solve for x
    x = 391,133.36/791.20
  6. Step 6: Final answer
    x = 494.35

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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.