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Finding the Fourth Proportional to 792.69, 1,188.17 and 381.54

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Solution

The fourth proportional to 792.69, 1,188.17 and 381.54 is: 571.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.69 : 1,188.17 = 381.54 : x
  2. Step 2: Convert to fraction form
    792.69/1,188.17 = 381.54/x
  3. Step 3: Cross multiply
    792.69x = 1,188.17 × 381.54
  4. Step 4: Simplify right side
    792.69x = 453,338.36
  5. Step 5: Solve for x
    x = 453,338.36/792.69
  6. Step 6: Final answer
    x = 571.90

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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.