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Finding the Third Proportional to 11,820 and 19,347

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Solution

The third proportional to 11,820 and 19,347 is: 31,667.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,820 : 19,347 = 19,347 : x
  2. Step 2: Convert to fraction form
    11,820/19,347 = 19,347/x
  3. Step 3: Cross multiply
    11,820x = 19,347 × 19,347
  4. Step 4: Simplify right side
    11,820x = 374,306,409
  5. Step 5: Solve for x
    x = 374,306,409/11,820
  6. Step 6: Final answer
    x = 31,667.21

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.