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Finding the Third Proportional to 78.31 and 121.44

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Solution

The third proportional to 78.31 and 121.44 is: 188.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.31 : 121.44 = 121.44 : x
  2. Step 2: Convert to fraction form
    78.31/121.44 = 121.44/x
  3. Step 3: Cross multiply
    78.31x = 121.44 × 121.44
  4. Step 4: Simplify right side
    78.31x = 14,747.07
  5. Step 5: Solve for x
    x = 14,747.07/78.31
  6. Step 6: Final answer
    x = 188.31

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.