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Finding the Third Proportional to 21,172 and 39,104

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Solution

The third proportional to 21,172 and 39,104 is: 72,223.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,172 : 39,104 = 39,104 : x
  2. Step 2: Convert to fraction form
    21,172/39,104 = 39,104/x
  3. Step 3: Cross multiply
    21,172x = 39,104 × 39,104
  4. Step 4: Simplify right side
    21,172x = 1,529,122,816
  5. Step 5: Solve for x
    x = 1,529,122,816/21,172
  6. Step 6: Final answer
    x = 72,223.82

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Why These Related Problems?

These problems maintain the same ratio (1.85) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.