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Finding the Fourth Proportional to 299.91, 449.35 and 213.10

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Solution

The fourth proportional to 299.91, 449.35 and 213.10 is: 319.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.91 : 449.35 = 213.10 : x
  2. Step 2: Convert to fraction form
    299.91/449.35 = 213.10/x
  3. Step 3: Cross multiply
    299.91x = 449.35 × 213.10
  4. Step 4: Simplify right side
    299.91x = 95,756.49
  5. Step 5: Solve for x
    x = 95,756.49/299.91
  6. Step 6: Final answer
    x = 319.28

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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.