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Finding the Fourth Proportional to 792.39, 1,187.82 and 329.88

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Solution

The fourth proportional to 792.39, 1,187.82 and 329.88 is: 494.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.39 : 1,187.82 = 329.88 : x
  2. Step 2: Convert to fraction form
    792.39/1,187.82 = 329.88/x
  3. Step 3: Cross multiply
    792.39x = 1,187.82 × 329.88
  4. Step 4: Simplify right side
    792.39x = 391,838.06
  5. Step 5: Solve for x
    x = 391,838.06/792.39
  6. Step 6: Final answer
    x = 494.50

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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.