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Finding the Third Proportional to 7,760 and 12,288

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Solution

The third proportional to 7,760 and 12,288 is: 19,458.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,760 : 12,288 = 12,288 : x
  2. Step 2: Convert to fraction form
    7,760/12,288 = 12,288/x
  3. Step 3: Cross multiply
    7,760x = 12,288 × 12,288
  4. Step 4: Simplify right side
    7,760x = 150,994,944
  5. Step 5: Solve for x
    x = 150,994,944/7,760
  6. Step 6: Final answer
    x = 19,458.11

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.