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Finding the Third Proportional to 78.31 and 169.44

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Solution

The third proportional to 78.31 and 169.44 is: 366.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.31 : 169.44 = 169.44 : x
  2. Step 2: Convert to fraction form
    78.31/169.44 = 169.44/x
  3. Step 3: Cross multiply
    78.31x = 169.44 × 169.44
  4. Step 4: Simplify right side
    78.31x = 28,708.40
  5. Step 5: Solve for x
    x = 28,708.40/78.31
  6. Step 6: Final answer
    x = 366.60

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.