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Finding the Fourth Proportional to 299.81, 449.85 and 287.66

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Solution

The fourth proportional to 299.81, 449.85 and 287.66 is: 431.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.81 : 449.85 = 287.66 : x
  2. Step 2: Convert to fraction form
    299.81/449.85 = 287.66/x
  3. Step 3: Cross multiply
    299.81x = 449.85 × 287.66
  4. Step 4: Simplify right side
    299.81x = 129,403.85
  5. Step 5: Solve for x
    x = 129,403.85/299.81
  6. Step 6: Final answer
    x = 431.62

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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.