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Finding the Fourth Proportional to 878.33, 1,318.22 and 445.61

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Solution

The fourth proportional to 878.33, 1,318.22 and 445.61 is: 668.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.33 : 1,318.22 = 445.61 : x
  2. Step 2: Convert to fraction form
    878.33/1,318.22 = 445.61/x
  3. Step 3: Cross multiply
    878.33x = 1,318.22 × 445.61
  4. Step 4: Simplify right side
    878.33x = 587,409.79
  5. Step 5: Solve for x
    x = 587,409.79/878.33
  6. Step 6: Final answer
    x = 668.78

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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.