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Finding the Third Proportional to 15,421 and 31,936

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Solution

The third proportional to 15,421 and 31,936 is: 66,137.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,421 : 31,936 = 31,936 : x
  2. Step 2: Convert to fraction form
    15,421/31,936 = 31,936/x
  3. Step 3: Cross multiply
    15,421x = 31,936 × 31,936
  4. Step 4: Simplify right side
    15,421x = 1,019,908,096
  5. Step 5: Solve for x
    x = 1,019,908,096/15,421
  6. Step 6: Final answer
    x = 66,137.61

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.