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Finding the Third Proportional to 18.63 and 38.94

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Solution

The third proportional to 18.63 and 38.94 is: 81.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.63 : 38.94 = 38.94 : x
  2. Step 2: Convert to fraction form
    18.63/38.94 = 38.94/x
  3. Step 3: Cross multiply
    18.63x = 38.94 × 38.94
  4. Step 4: Simplify right side
    18.63x = 1,516.13
  5. Step 5: Solve for x
    x = 1,516.13/18.63
  6. Step 6: Final answer
    x = 81.40

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.