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Finding the Third Proportional to 18,240 and 39,288

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Solution

The third proportional to 18,240 and 39,288 is: 84,624.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,240 : 39,288 = 39,288 : x
  2. Step 2: Convert to fraction form
    18,240/39,288 = 39,288/x
  3. Step 3: Cross multiply
    18,240x = 39,288 × 39,288
  4. Step 4: Simplify right side
    18,240x = 1,543,546,944
  5. Step 5: Solve for x
    x = 1,543,546,944/18,240
  6. Step 6: Final answer
    x = 84,624.28

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.