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Finding the Fourth Proportional to 299.61, 449.42 and 258.57

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Solution

The fourth proportional to 299.61, 449.42 and 258.57 is: 387.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.61 : 449.42 = 258.57 : x
  2. Step 2: Convert to fraction form
    299.61/449.42 = 258.57/x
  3. Step 3: Cross multiply
    299.61x = 449.42 × 258.57
  4. Step 4: Simplify right side
    299.61x = 116,205.24
  5. Step 5: Solve for x
    x = 116,205.24/299.61
  6. Step 6: Final answer
    x = 387.86

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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.