Under certain conditions on continuous functions μ, λ, a, and f, we prove the inequality ∫0y μ (x)λ (x)f(∫0xλ (t)a(t)dt∫0 xλ (t)dt)dx ≤ K ∫0y μ (x)λ (x)f(a(x)) dx, y ≤ ∞, and describe its application to the investigation of the problem of finding conditions under which Laplace integrals belong to a class of convergence. © Springer Science+Business Media, Inc. 2006.