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Finding the Third Proportional to 18,516 and 39,621

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Solution

The third proportional to 18,516 and 39,621 is: 84,782.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,516 : 39,621 = 39,621 : x
  2. Step 2: Convert to fraction form
    18,516/39,621 = 39,621/x
  3. Step 3: Cross multiply
    18,516x = 39,621 × 39,621
  4. Step 4: Simplify right side
    18,516x = 1,569,823,641
  5. Step 5: Solve for x
    x = 1,569,823,641/18,516
  6. Step 6: Final answer
    x = 84,782.01

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.