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Finding the Third Proportional to 13,620 and 21,685

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Solution

The third proportional to 13,620 and 21,685 is: 34,525.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620 : 21,685 = 21,685 : x
  2. Step 2: Convert to fraction form
    13,620/21,685 = 21,685/x
  3. Step 3: Cross multiply
    13,620x = 21,685 × 21,685
  4. Step 4: Simplify right side
    13,620x = 470,239,225
  5. Step 5: Solve for x
    x = 470,239,225/13,620
  6. Step 6: Final answer
    x = 34,525.64

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.