Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_57 (compression_ratio VARCHAR, dx_10_name VARCHAR, fourcc VARCHAR)
### Question:
Which Compression ratio has a (none) DX 10 Name and a FOURCC of dxt4?
### Answer:
SELECT compression_ratio FROM table_name_57 WHERE dx_10_name = "(none)" AND fourcc = "dxt4"