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Finding the Fourth Proportional to 449.25, 672.90 and 311.64

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Solution

The fourth proportional to 449.25, 672.90 and 311.64 is: 466.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.25 : 672.90 = 311.64 : x
  2. Step 2: Convert to fraction form
    449.25/672.90 = 311.64/x
  3. Step 3: Cross multiply
    449.25x = 672.90 × 311.64
  4. Step 4: Simplify right side
    449.25x = 209,702.56
  5. Step 5: Solve for x
    x = 209,702.56/449.25
  6. Step 6: Final answer
    x = 466.78

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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.