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Finding the Third Proportional to 108.75 and 205.75

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Solution

The third proportional to 108.75 and 205.75 is: 389.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.75 : 205.75 = 205.75 : x
  2. Step 2: Convert to fraction form
    108.75/205.75 = 205.75/x
  3. Step 3: Cross multiply
    108.75x = 205.75 × 205.75
  4. Step 4: Simplify right side
    108.75x = 42,333.06
  5. Step 5: Solve for x
    x = 42,333.06/108.75
  6. Step 6: Final answer
    x = 389.27

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Why These Related Problems?

These problems maintain the same ratio (1.89) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.