Answer:
Numbers 2 and 4 are in the ratio 4:2, therefore the results are:
Explanation:
1.Vowels to consonants in the word ratio
- Vowels (a,i,o), Consonants (r,t)
- Ratio of Vowels to Consonants =3:2

2.Even digits to odd digits in 824,396
- Even digits(8,2,4,6), Odd Digits (3,9)
- Ratio of Even Digits to Odd Digits=4:2
3. Composite digits to prime digits in 638,527
- Composite Digits(6,8), Prime(3,5,2,7)
- Ratio of Composite Digits to Odd=2:4

4. Consonants to vowels in the word cubism
- Consonants(c,b,s,m), Vowels(u,i)
- Ratio of Consonant to Vowels =4:2