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Finding the Fourth Proportional to 878.38, 1,211.64 and 529

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Solution

The fourth proportional to 878.38, 1,211.64 and 529 is: 729.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.38 : 1,211.64 = 529 : x
  2. Step 2: Convert to fraction form
    878.38/1,211.64 = 529/x
  3. Step 3: Cross multiply
    878.38x = 1,211.64 × 529
  4. Step 4: Simplify right side
    878.38x = 640,957.56
  5. Step 5: Solve for x
    x = 640,957.56/878.38
  6. Step 6: Final answer
    x = 729.70

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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.