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Finding the Fourth Proportional to 879.42, 1,318.89 and 445.98

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Solution

The fourth proportional to 879.42, 1,318.89 and 445.98 is: 668.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.42 : 1,318.89 = 445.98 : x
  2. Step 2: Convert to fraction form
    879.42/1,318.89 = 445.98/x
  3. Step 3: Cross multiply
    879.42x = 1,318.89 × 445.98
  4. Step 4: Simplify right side
    879.42x = 588,198.56
  5. Step 5: Solve for x
    x = 588,198.56/879.42
  6. Step 6: Final answer
    x = 668.85

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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.