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Finding the Third Proportional to 3,936 and 9,280

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Solution

The third proportional to 3,936 and 9,280 is: 21,879.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936 : 9,280 = 9,280 : x
  2. Step 2: Convert to fraction form
    3,936/9,280 = 9,280/x
  3. Step 3: Cross multiply
    3,936x = 9,280 × 9,280
  4. Step 4: Simplify right side
    3,936x = 86,118,400
  5. Step 5: Solve for x
    x = 86,118,400/3,936
  6. Step 6: Final answer
    x = 21,879.67

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.