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Finding the Third Proportional to 78.75 and 126.75

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Solution

The third proportional to 78.75 and 126.75 is: 204.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.75 : 126.75 = 126.75 : x
  2. Step 2: Convert to fraction form
    78.75/126.75 = 126.75/x
  3. Step 3: Cross multiply
    78.75x = 126.75 × 126.75
  4. Step 4: Simplify right side
    78.75x = 16,065.56
  5. Step 5: Solve for x
    x = 16,065.56/78.75
  6. Step 6: Final answer
    x = 204.01

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.