Question

If 121 : a :: a : 4. Find the value of a ?
plz answer fast plz​

Answer 1

Answer:

product of extreme=product of mean.

121*4=a*a

a*a=484

a square=484

therefore a=22

Answer 2

Answer:

a= ±22

Step-by-step explanation:  

given 121/a=a/4

taking 4 to LHS and 'a' to RHS,

    equation modifies to 121 x 4=a²

    taking square roots both sides,

          11 x 2 = ± a

          hence, a=±22

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hope it helped !!