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Finding the Third Proportional to 120.75 and 177.56

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Solution

The third proportional to 120.75 and 177.56 is: 261.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.75 : 177.56 = 177.56 : x
  2. Step 2: Convert to fraction form
    120.75/177.56 = 177.56/x
  3. Step 3: Cross multiply
    120.75x = 177.56 × 177.56
  4. Step 4: Simplify right side
    120.75x = 31,528.44
  5. Step 5: Solve for x
    x = 31,528.44/120.75
  6. Step 6: Final answer
    x = 261.11

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.