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Finding the Third Proportional to 225 and 380.25

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Solution

The third proportional to 225 and 380.25 is: 642.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    225 : 380.25 = 380.25 : x
  2. Step 2: Convert to fraction form
    225/380.25 = 380.25/x
  3. Step 3: Cross multiply
    225x = 380.25 × 380.25
  4. Step 4: Simplify right side
    225x = 144,590.06
  5. Step 5: Solve for x
    x = 144,590.06/225
  6. Step 6: Final answer
    x = 642.62

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Why These Related Problems?

These problems maintain the same ratio (1.69) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.