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Finding the Third Proportional to 221.25 and 339.63

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Solution

The third proportional to 221.25 and 339.63 is: 521.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.25 : 339.63 = 339.63 : x
  2. Step 2: Convert to fraction form
    221.25/339.63 = 339.63/x
  3. Step 3: Cross multiply
    221.25x = 339.63 × 339.63
  4. Step 4: Simplify right side
    221.25x = 115,345.14
  5. Step 5: Solve for x
    x = 115,345.14/221.25
  6. Step 6: Final answer
    x = 521.33

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.