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Finding the Third Proportional to 21 and 49.25

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Solution

The third proportional to 21 and 49.25 is: 115.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21 : 49.25 = 49.25 : x
  2. Step 2: Convert to fraction form
    21/49.25 = 49.25/x
  3. Step 3: Cross multiply
    21x = 49.25 × 49.25
  4. Step 4: Simplify right side
    21x = 2,425.56
  5. Step 5: Solve for x
    x = 2,425.56/21
  6. Step 6: Final answer
    x = 115.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.