Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_31 (population_density__per_km²_ VARCHAR, gdp__ppp__$m_usd VARCHAR)

### Question ###
How much is the population density with a GDP at $188,112?

### Accurate SQL ###

SELECT population_density__per_km²_ FROM table_name_31 WHERE gdp__ppp__$m_usd = "$188,112"