Number analogy: second = first x 3

The same question, asked 2 times: 19 Jul 2023 S1*, 25 Sep 2024 S3. Every wording below, oldest first.

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Question 1
19 Jul 2023 S1
5 $Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number. 7 : 21 :: 14 : 42 :: 18 : ?$
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Question 2
25 Sep 2024 S3
6 $14 is related to 42 following a certain logic. Following the same logic, 26 is related to 78. To which of the following is 47 related, following the same logic? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 - Operations on 13 such as adding /deleting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)$
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Question 1