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Finding the Fourth Proportional to 300.20, 449.70 and 207.42

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Solution

The fourth proportional to 300.20, 449.70 and 207.42 is: 310.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.20 : 449.70 = 207.42 : x
  2. Step 2: Convert to fraction form
    300.20/449.70 = 207.42/x
  3. Step 3: Cross multiply
    300.20x = 449.70 × 207.42
  4. Step 4: Simplify right side
    300.20x = 93,274.31
  5. Step 5: Solve for x
    x = 93,274.31/300.20
  6. Step 6: Final answer
    x = 310.71

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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.