\[\boxed{\text{434\ (434).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[При\ b = 7569;\ \ \ c = 3:\]
\[b\ :c = 7569\ :3 = 2523.\]
\[При\ b = 345\ 365;\ \ \ c = 5:\]
\[\text{b\ }:c = 345\ 365\ :5 = 69\ 073.\]