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Finding the Third Proportional to 18,039 and 39,399

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Solution

The third proportional to 18,039 and 39,399 is: 86,051.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,039 : 39,399 = 39,399 : x
  2. Step 2: Convert to fraction form
    18,039/39,399 = 39,399/x
  3. Step 3: Cross multiply
    18,039x = 39,399 × 39,399
  4. Step 4: Simplify right side
    18,039x = 1,552,281,201
  5. Step 5: Solve for x
    x = 1,552,281,201/18,039
  6. Step 6: Final answer
    x = 86,051.40

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.