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Finding the Third Proportional to 20 and 43

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Solution

The third proportional to 20 and 43 is: 92.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20 : 43 = 43 : x
  2. Step 2: Convert to fraction form
    20/43 = 43/x
  3. Step 3: Cross multiply
    20x = 43 × 43
  4. Step 4: Simplify right side
    20x = 1,849
  5. Step 5: Solve for x
    x = 1,849/20
  6. Step 6: Final answer
    x = 92.45

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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.