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Finding the Fourth Proportional to 878.46, 1,212.42 and 668.30

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Solution

The fourth proportional to 878.46, 1,212.42 and 668.30 is: 922.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.46 : 1,212.42 = 668.30 : x
  2. Step 2: Convert to fraction form
    878.46/1,212.42 = 668.30/x
  3. Step 3: Cross multiply
    878.46x = 1,212.42 × 668.30
  4. Step 4: Simplify right side
    878.46x = 810,256.73
  5. Step 5: Solve for x
    x = 810,256.73/878.46
  6. Step 6: Final answer
    x = 922.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.