the dimensionless constant

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when we do the dimensional analysis for the period of the pendulum we get:$$ {T =f (L,M,g, θ )}$$ We begin by writing the period as a product of these given quantities that have dimensions: $${T = b*L^x*M^y*g^z}~~(θ~ is ~dimensionless) $$ where b is a dimensionless constant. My question is why do we multiply by the dimensionless constant?