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Finding the Third Proportional to 16 and 18

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Solution

The third proportional to 16 and 18 is: 20.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    16 : 18 = 18 : x
  2. Step 2: Convert to fraction form
    16/18 = 18/x
  3. Step 3: Cross multiply
    16x = 18 × 18
  4. Step 4: Simplify right side
    16x = 324
  5. Step 5: Solve for x
    x = 324/16
  6. Step 6: Final answer
    x = 20.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.