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Finding the Third Proportional to 5,178 and 7,515

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Solution

The third proportional to 5,178 and 7,515 is: 10,906.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,178 : 7,515 = 7,515 : x
  2. Step 2: Convert to fraction form
    5,178/7,515 = 7,515/x
  3. Step 3: Cross multiply
    5,178x = 7,515 × 7,515
  4. Step 4: Simplify right side
    5,178x = 56,475,225
  5. Step 5: Solve for x
    x = 56,475,225/5,178
  6. Step 6: Final answer
    x = 10,906.76

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.