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Finding the Third Proportional to 5,390 and 11,916

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Solution

The third proportional to 5,390 and 11,916 is: 26,343.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,390 : 11,916 = 11,916 : x
  2. Step 2: Convert to fraction form
    5,390/11,916 = 11,916/x
  3. Step 3: Cross multiply
    5,390x = 11,916 × 11,916
  4. Step 4: Simplify right side
    5,390x = 141,991,056
  5. Step 5: Solve for x
    x = 141,991,056/5,390
  6. Step 6: Final answer
    x = 26,343.42

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.