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Finding the Third Proportional to 18.21 and 20.50

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Solution

The third proportional to 18.21 and 20.50 is: 23.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.21 : 20.50 = 20.50 : x
  2. Step 2: Convert to fraction form
    18.21/20.50 = 20.50/x
  3. Step 3: Cross multiply
    18.21x = 20.50 × 20.50
  4. Step 4: Simplify right side
    18.21x = 420.09
  5. Step 5: Solve for x
    x = 420.09/18.21
  6. Step 6: Final answer
    x = 23.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.