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Finding the Fourth Proportional to 792.38, 1,188.83 and 381.56

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Solution

The fourth proportional to 792.38, 1,188.83 and 381.56 is: 572.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.38 : 1,188.83 = 381.56 : x
  2. Step 2: Convert to fraction form
    792.38/1,188.83 = 381.56/x
  3. Step 3: Cross multiply
    792.38x = 1,188.83 × 381.56
  4. Step 4: Simplify right side
    792.38x = 453,609.53
  5. Step 5: Solve for x
    x = 453,609.53/792.38
  6. Step 6: Final answer
    x = 572.46

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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.