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Finding the Third Proportional to 15 and 20.25

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Solution

The third proportional to 15 and 20.25 is: 27.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15 : 20.25 = 20.25 : x
  2. Step 2: Convert to fraction form
    15/20.25 = 20.25/x
  3. Step 3: Cross multiply
    15x = 20.25 × 20.25
  4. Step 4: Simplify right side
    15x = 410.06
  5. Step 5: Solve for x
    x = 410.06/15
  6. Step 6: Final answer
    x = 27.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.