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Finding the Third Proportional to 78.12 and 163.69

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Solution

The third proportional to 78.12 and 163.69 is: 342.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.12 : 163.69 = 163.69 : x
  2. Step 2: Convert to fraction form
    78.12/163.69 = 163.69/x
  3. Step 3: Cross multiply
    78.12x = 163.69 × 163.69
  4. Step 4: Simplify right side
    78.12x = 26,793.60
  5. Step 5: Solve for x
    x = 26,793.60/78.12
  6. Step 6: Final answer
    x = 342.99

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.