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Finding the Third Proportional to 108.21 and 143.09

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Solution

The third proportional to 108.21 and 143.09 is: 189.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.21 : 143.09 = 143.09 : x
  2. Step 2: Convert to fraction form
    108.21/143.09 = 143.09/x
  3. Step 3: Cross multiply
    108.21x = 143.09 × 143.09
  4. Step 4: Simplify right side
    108.21x = 20,476.10
  5. Step 5: Solve for x
    x = 20,476.10/108.21
  6. Step 6: Final answer
    x = 189.22

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.