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Finding the Fourth Proportional to 878.42, 1,318.31 and 331.10

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Solution

The fourth proportional to 878.42, 1,318.31 and 331.10 is: 496.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.42 : 1,318.31 = 331.10 : x
  2. Step 2: Convert to fraction form
    878.42/1,318.31 = 331.10/x
  3. Step 3: Cross multiply
    878.42x = 1,318.31 × 331.10
  4. Step 4: Simplify right side
    878.42x = 436,492.44
  5. Step 5: Solve for x
    x = 436,492.44/878.42
  6. Step 6: Final answer
    x = 496.91

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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.