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Finding the Fourth Proportional to 423.45, 635.31 and 149.72

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Solution

The fourth proportional to 423.45, 635.31 and 149.72 is: 224.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.45 : 635.31 = 149.72 : x
  2. Step 2: Convert to fraction form
    423.45/635.31 = 149.72/x
  3. Step 3: Cross multiply
    423.45x = 635.31 × 149.72
  4. Step 4: Simplify right side
    423.45x = 95,115.44
  5. Step 5: Solve for x
    x = 95,115.44/423.45
  6. Step 6: Final answer
    x = 224.62

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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.