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  1. The third proportional of 12 and 18 is
    1. 3
    2. 6
    3. 27
    4. 144
Correct Option: C

Third proportional of 12 and 18 = x
∴  12 : 18 = 18 : x

⇒  x =
18 × 18
 = 27
12

Second Method :
Third proportion =
b2
 =
182
a12

=
18 × 18
 = 27
12


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