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Finding the Third Proportional to 18,688.50 and 20,268

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Solution

The third proportional to 18,688.50 and 20,268 is: 21,980.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688.50 : 20,268 = 20,268 : x
  2. Step 2: Convert to fraction form
    18,688.50/20,268 = 20,268/x
  3. Step 3: Cross multiply
    18,688.50x = 20,268 × 20,268
  4. Step 4: Simplify right side
    18,688.50x = 410,791,824
  5. Step 5: Solve for x
    x = 410,791,824/18,688.50
  6. Step 6: Final answer
    x = 21,980.99

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.