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Finding the Third Proportional to 78.25 and 120.75

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Solution

The third proportional to 78.25 and 120.75 is: 186.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.25 : 120.75 = 120.75 : x
  2. Step 2: Convert to fraction form
    78.25/120.75 = 120.75/x
  3. Step 3: Cross multiply
    78.25x = 120.75 × 120.75
  4. Step 4: Simplify right side
    78.25x = 14,580.56
  5. Step 5: Solve for x
    x = 14,580.56/78.25
  6. Step 6: Final answer
    x = 186.33

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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.