Analogy Questions

In the following question, select the related number from the given alternatives.
243 : 578 : : 163 : ?

Choose the related word/letters/number from the given alternatives. 19 : 6859 : : 21 : ?

Pond is related to Water in the same way as Mountain is related to

Select the related word/letters/number from the given alternatives.
AEG: GKM :: MQS : ?

In the following question, select the related number from the given alternatives.
4 : 17 : : 7 : ?

In the following question, select the related letters from the given alternatives.
JQXE : LSZG : : MTNL : ?

Choose the related word/letters/number from the given alternatives.
AF : BE : : ? : DH

In the following question, select the related number from the given alternatives.
243 : 819 : : 163 : ?