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Finding the Fourth Proportional to 299.75, 449.31 and 145.36

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Solution

The fourth proportional to 299.75, 449.31 and 145.36 is: 217.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.75 : 449.31 = 145.36 : x
  2. Step 2: Convert to fraction form
    299.75/449.31 = 145.36/x
  3. Step 3: Cross multiply
    299.75x = 449.31 × 145.36
  4. Step 4: Simplify right side
    299.75x = 65,310.58
  5. Step 5: Solve for x
    x = 65,310.58/299.75
  6. Step 6: Final answer
    x = 217.88

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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.