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Finding the Fourth Proportional to 792.18, 1,187.94 and 381.22

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Solution

The fourth proportional to 792.18, 1,187.94 and 381.22 is: 571.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.18 : 1,187.94 = 381.22 : x
  2. Step 2: Convert to fraction form
    792.18/1,187.94 = 381.22/x
  3. Step 3: Cross multiply
    792.18x = 1,187.94 × 381.22
  4. Step 4: Simplify right side
    792.18x = 452,866.49
  5. Step 5: Solve for x
    x = 452,866.49/792.18
  6. Step 6: Final answer
    x = 571.67

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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.