Postgres percent_rank() across rows not column - postgresql

Question

Data:
I have a postgres table where each row contain a question_id, and count values of when a user pressed a button.
+----------+-----------+------+-----+----------+
| Question | Very Good | Good | Bad | Very Bad |
+----------+-----------+------+-----+----------+
| 1 | 23 | 12 | 23 | 67 |
+----------+-----------+------+-----+----------+
| 2 | 56 | 90 | 23 | 18 |
+----------+-----------+------+-----+----------+
Requirement:
I want to be able to convert each row value in a percentage of the total row.
+----------+-----------+-------+-------+----------+
| Question | Very Good | Good | Bad | Very Bad |
+----------+-----------+-------+-------+----------+
| 1 | 18.4 | 9.6 | 18.4 | 53.8 |
+----------+-----------+-------+-------+----------+
| 2 | 29.94 | 48.12 | 12.29 | 9.6 |
+----------+-----------+-------+-------+----------+
Attempt:
I found that percent_rank() will show me the percentage based off columns, I'm wondering is there a similar function which works row wise?
SELECT
question_id,
PERCENT_RANK() OVER (
ORDER BY Very_good
),
PERCENT_RANK() OVER (
ORDER BY Good
)
PERCENT_RANK() OVER (
ORDER BY Bad
)
PERCENT_RANK() OVER (
ORDER BY Very Bad
)
FROM Question_feedback

Answer 1

I'm afraid the only thing that will work is to do this manually:
SELECT
question_id,
Very_good::double precision / (Very_good + Good + Bad + Very_bad),
Good::double precision / (Very_good + Good + Bad + Very_bad),
Bad::double precision / (Very_good + Good + Bad + Very_bad),
Very_bad::double precision / (Very_good + Good + Bad + Very_bad)
FROM Question_feedback
The good news is it will be faster than PERCENT_RANK because it only needs to consider that row, which is much cheaper.

Answer 2

Working Solution
WITH QUESTION_FEEDBACK
AS (SELECT 1 AS QUESTION,
23 VERYGOOD,
12 GOOD,
23 BAD,
67 VERYBAD
UNION ALL
SELECT 2 AS QUESTION,
56 VERYGOOD,
90 GOOD,
23 BAD,
18 VERYBAD
)
SELECT QUESTION,
VERYGOOD,
GOOD,
BAD,
VERYBAD,
(CAST(VERYGOOD AS DECIMAL) / SUM (VERYGOOD + GOOD + BAD + VERYBAD) OVER (PARTITION BY QUESTION))*100 VERYGOODPER,
(CAST(GOOD AS DECIMAL) / SUM (VERYGOOD + GOOD + BAD + VERYBAD) OVER (PARTITION BY QUESTION))*100 GOODPER,
(CAST(BAD AS DECIMAL) / SUM (VERYGOOD + GOOD + BAD + VERYBAD) OVER (PARTITION BY QUESTION) )*100 BADPER,
(CAST(VERYBAD AS DECIMAL) / SUM (VERYGOOD + GOOD + BAD + VERYBAD) OVER (PARTITION BY QUESTION))*100 VERYBADPER
FROM QUESTION_FEEDBACK