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Finding the Third Proportional to 7,890 and 11,317

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Solution

The third proportional to 7,890 and 11,317 is: 16,232.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,890 : 11,317 = 11,317 : x
  2. Step 2: Convert to fraction form
    7,890/11,317 = 11,317/x
  3. Step 3: Cross multiply
    7,890x = 11,317 × 11,317
  4. Step 4: Simplify right side
    7,890x = 128,074,489
  5. Step 5: Solve for x
    x = 128,074,489/7,890
  6. Step 6: Final answer
    x = 16,232.51

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.