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Finding the Third Proportional to 15.75 and 17.81

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Solution

The third proportional to 15.75 and 17.81 is: 20.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.75 : 17.81 = 17.81 : x
  2. Step 2: Convert to fraction form
    15.75/17.81 = 17.81/x
  3. Step 3: Cross multiply
    15.75x = 17.81 × 17.81
  4. Step 4: Simplify right side
    15.75x = 317.29
  5. Step 5: Solve for x
    x = 317.29/15.75
  6. Step 6: Final answer
    x = 20.15

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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.