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Finding the Fourth Proportional to 878.38, 1,211.97 and 529.18

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Solution

The fourth proportional to 878.38, 1,211.97 and 529.18 is: 730.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.38 : 1,211.97 = 529.18 : x
  2. Step 2: Convert to fraction form
    878.38/1,211.97 = 529.18/x
  3. Step 3: Cross multiply
    878.38x = 1,211.97 × 529.18
  4. Step 4: Simplify right side
    878.38x = 641,350.28
  5. Step 5: Solve for x
    x = 641,350.28/878.38
  6. Step 6: Final answer
    x = 730.15

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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.