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Finding the Fourth Proportional to 792.31, 1,187.72 and 329.79

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Solution

The fourth proportional to 792.31, 1,187.72 and 329.79 is: 494.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.31 : 1,187.72 = 329.79 : x
  2. Step 2: Convert to fraction form
    792.31/1,187.72 = 329.79/x
  3. Step 3: Cross multiply
    792.31x = 1,187.72 × 329.79
  4. Step 4: Simplify right side
    792.31x = 391,696.53
  5. Step 5: Solve for x
    x = 391,696.53/792.31
  6. Step 6: Final answer
    x = 494.37

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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.