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Finding the Third Proportional to 221.91 and 325.69

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Solution

The third proportional to 221.91 and 325.69 is: 478.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.91 : 325.69 = 325.69 : x
  2. Step 2: Convert to fraction form
    221.91/325.69 = 325.69/x
  3. Step 3: Cross multiply
    221.91x = 325.69 × 325.69
  4. Step 4: Simplify right side
    221.91x = 106,072.35
  5. Step 5: Solve for x
    x = 106,072.35/221.91
  6. Step 6: Final answer
    x = 478.01

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.