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Finding the Third Proportional to 221.63 and 308.81

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Solution

The third proportional to 221.63 and 308.81 is: 430.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.63 : 308.81 = 308.81 : x
  2. Step 2: Convert to fraction form
    221.63/308.81 = 308.81/x
  3. Step 3: Cross multiply
    221.63x = 308.81 × 308.81
  4. Step 4: Simplify right side
    221.63x = 95,365.16
  5. Step 5: Solve for x
    x = 95,365.16/221.63
  6. Step 6: Final answer
    x = 430.30

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.