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Finding the Fourth Proportional to 791.65, 1,187.62 and 329.18

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Solution

The fourth proportional to 791.65, 1,187.62 and 329.18 is: 493.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.65 : 1,187.62 = 329.18 : x
  2. Step 2: Convert to fraction form
    791.65/1,187.62 = 329.18/x
  3. Step 3: Cross multiply
    791.65x = 1,187.62 × 329.18
  4. Step 4: Simplify right side
    791.65x = 390,934.81
  5. Step 5: Solve for x
    x = 390,934.81/791.65
  6. Step 6: Final answer
    x = 493.83

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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.