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Finding the Third Proportional to 5,120 and 7,680

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Solution

The third proportional to 5,120 and 7,680 is: 11,520

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120 : 7,680 = 7,680 : x
  2. Step 2: Convert to fraction form
    5,120/7,680 = 7,680/x
  3. Step 3: Cross multiply
    5,120x = 7,680 × 7,680
  4. Step 4: Simplify right side
    5,120x = 58,982,400
  5. Step 5: Solve for x
    x = 58,982,400/5,120
  6. Step 6: Final answer
    x = 11,520

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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.