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Finding the Third Proportional to 155.20 and 323.21

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Solution

The third proportional to 155.20 and 323.21 is: 673.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.20 : 323.21 = 323.21 : x
  2. Step 2: Convert to fraction form
    155.20/323.21 = 323.21/x
  3. Step 3: Cross multiply
    155.20x = 323.21 × 323.21
  4. Step 4: Simplify right side
    155.20x = 104,464.05
  5. Step 5: Solve for x
    x = 104,464.05/155.20
  6. Step 6: Final answer
    x = 673.10

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.