Common ratio of a positive geometric progression and a later term in standard form

Every term of the geometric progression \(u_1, u_2, u_3, \ldots\) is positive. The fourth term is \(2.7\times10^4\) and the sixth term is \(2.43\times10^5\).

1. Find the common ratio of the progression.[3]
2. Find \(u_{10}\), giving your answer in the form \(a\times10^k\), where \(1\leq a<10\) and \(k\in\mathbb{Z}\).[3]