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Finding the Fourth Proportional to 879.10, 1,318.46 and 331.32

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Solution

The fourth proportional to 879.10, 1,318.46 and 331.32 is: 496.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.10 : 1,318.46 = 331.32 : x
  2. Step 2: Convert to fraction form
    879.10/1,318.46 = 331.32/x
  3. Step 3: Cross multiply
    879.10x = 1,318.46 × 331.32
  4. Step 4: Simplify right side
    879.10x = 436,832.17
  5. Step 5: Solve for x
    x = 436,832.17/879.10
  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.