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Finding the Third Proportional to 21.19 and 33.28

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Solution

The third proportional to 21.19 and 33.28 is: 52.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.19 : 33.28 = 33.28 : x
  2. Step 2: Convert to fraction form
    21.19/33.28 = 33.28/x
  3. Step 3: Cross multiply
    21.19x = 33.28 × 33.28
  4. Step 4: Simplify right side
    21.19x = 1,107.64
  5. Step 5: Solve for x
    x = 1,107.64/21.19
  6. Step 6: Final answer
    x = 52.28

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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.