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Finding the Fourth Proportional to 879.14, 1,318.73 and 331.21

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Solution

The fourth proportional to 879.14, 1,318.73 and 331.21 is: 496.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.14 : 1,318.73 = 331.21 : x
  2. Step 2: Convert to fraction form
    879.14/1,318.73 = 331.21/x
  3. Step 3: Cross multiply
    879.14x = 1,318.73 × 331.21
  4. Step 4: Simplify right side
    879.14x = 436,776.56
  5. Step 5: Solve for x
    x = 436,776.56/879.14
  6. Step 6: Final answer
    x = 496.82

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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.