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Finding the Fourth Proportional to 299.50, 449.32 and 213

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Solution

The fourth proportional to 299.50, 449.32 and 213 is: 319.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.50 : 449.32 = 213 : x
  2. Step 2: Convert to fraction form
    299.50/449.32 = 213/x
  3. Step 3: Cross multiply
    299.50x = 449.32 × 213
  4. Step 4: Simplify right side
    299.50x = 95,704.63
  5. Step 5: Solve for x
    x = 95,704.63/299.50
  6. Step 6: Final answer
    x = 319.55

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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.