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Finding the Third Proportional to 78.75 and 109.13

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Solution

The third proportional to 78.75 and 109.13 is: 151.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.75 : 109.13 = 109.13 : x
  2. Step 2: Convert to fraction form
    78.75/109.13 = 109.13/x
  3. Step 3: Cross multiply
    78.75x = 109.13 × 109.13
  4. Step 4: Simplify right side
    78.75x = 11,908.27
  5. Step 5: Solve for x
    x = 11,908.27/78.75
  6. Step 6: Final answer
    x = 151.22

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.