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Finding the Third Proportional to 18.70 and 20.39

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Solution

The third proportional to 18.70 and 20.39 is: 22.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.70 : 20.39 = 20.39 : x
  2. Step 2: Convert to fraction form
    18.70/20.39 = 20.39/x
  3. Step 3: Cross multiply
    18.70x = 20.39 × 20.39
  4. Step 4: Simplify right side
    18.70x = 415.78
  5. Step 5: Solve for x
    x = 415.78/18.70
  6. Step 6: Final answer
    x = 22.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.