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Finding the Third Proportional to 5,136.75 and 7,728.75

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Solution

The third proportional to 5,136.75 and 7,728.75 is: 11,628.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,136.75 : 7,728.75 = 7,728.75 : x
  2. Step 2: Convert to fraction form
    5,136.75/7,728.75 = 7,728.75/x
  3. Step 3: Cross multiply
    5,136.75x = 7,728.75 × 7,728.75
  4. Step 4: Simplify right side
    5,136.75x = 59,733,576.56
  5. Step 5: Solve for x
    x = 59,733,576.56/5,136.75
  6. Step 6: Final answer
    x = 11,628.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.