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Finding the Third Proportional to 5,190 and 7,865

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Solution

The third proportional to 5,190 and 7,865 is: 11,918.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,190 : 7,865 = 7,865 : x
  2. Step 2: Convert to fraction form
    5,190/7,865 = 7,865/x
  3. Step 3: Cross multiply
    5,190x = 7,865 × 7,865
  4. Step 4: Simplify right side
    5,190x = 61,858,225
  5. Step 5: Solve for x
    x = 61,858,225/5,190
  6. Step 6: Final answer
    x = 11,918.73

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.