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Finding the Third Proportional to 21 and 33

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Solution

The third proportional to 21 and 33 is: 51.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21 : 33 = 33 : x
  2. Step 2: Convert to fraction form
    21/33 = 33/x
  3. Step 3: Cross multiply
    21x = 33 × 33
  4. Step 4: Simplify right side
    21x = 1,089
  5. Step 5: Solve for x
    x = 1,089/21
  6. Step 6: Final answer
    x = 51.86

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.