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Finding the Third Proportional to 21.00 and 45.47

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Solution

The third proportional to 21.00 and 45.47 is: 98.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.00 : 45.47 = 45.47 : x
  2. Step 2: Convert to fraction form
    21.00/45.47 = 45.47/x
  3. Step 3: Cross multiply
    21.00x = 45.47 × 45.47
  4. Step 4: Simplify right side
    21.00x = 2,067.13
  5. Step 5: Solve for x
    x = 2,067.13/21.00
  6. Step 6: Final answer
    x = 98.44

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.