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Finding the Fourth Proportional to 878.97, 1,212.61 and 617.16

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Solution

The fourth proportional to 878.97, 1,212.61 and 617.16 is: 851.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.97 : 1,212.61 = 617.16 : x
  2. Step 2: Convert to fraction form
    878.97/1,212.61 = 617.16/x
  3. Step 3: Cross multiply
    878.97x = 1,212.61 × 617.16
  4. Step 4: Simplify right side
    878.97x = 748,374.39
  5. Step 5: Solve for x
    x = 748,374.39/878.97
  6. Step 6: Final answer
    x = 851.42

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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.