The phrase "a relative interest" is correct and usable in written English.
It can be used when discussing an interest that is comparative or dependent on other factors or interests.
Example: "In the context of the project, we need to consider a relative interest in the market trends to make informed decisions."
Alternatives: "a comparative interest" or "an associated interest".
Cluster 3 was comprised of persons whose ratings suggested a greater relative interest in pain relief than the other outcome domains.
Still, the odd thing manages to snap me into a state of relative interest.
This enabled us to obtain an idea of Spain's relative interest in HRQL research in breast cancer patients within a more international context.
Hitherto, foreigners have remained net purchasers of local assets even in the face of lower relative interest rates and a weaker rand.
The new profit prediction comes as Washington policymakers increasingly focus on soaring student debt levels and the record relative interest rates that borrowers pay as a potential impediment to economic growth.
Millions of student borrowers are paying record relative interest rates on their government loans, according to a Huffington Post review, frustrating efforts by policymakers to reduce borrowing costs for households.
Millions of student borrowers are paying record relative interest rates on their government loans, according to a HuffPost review, frustrating efforts by the Fed to reduce borrowing costs for households and businesses.
Millions of student borrowers are also paying record relative interest rates on their government loans, according to a Huffington Post review, frustrating efforts by the Fed to reduce borrowing costs for households and businesses.
Sallie Mae's preferred measurement also neglects the relative interest rate paid by student borrowers, whose rates in a normally functioning competitive market would move in tandem with interest rates in the broader economy.
They have already determined the relative interest in the teams; now they must figure out how to get those fans to buy.
