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Finding the Third Proportional to 142.88 and 221.63

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Solution

The third proportional to 142.88 and 221.63 is: 343.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.88 : 221.63 = 221.63 : x
  2. Step 2: Convert to fraction form
    142.88/221.63 = 221.63/x
  3. Step 3: Cross multiply
    142.88x = 221.63 × 221.63
  4. Step 4: Simplify right side
    142.88x = 49,117.64
  5. Step 5: Solve for x
    x = 49,117.64/142.88
  6. Step 6: Final answer
    x = 343.78

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.