The phrase "a powerful rationale" is correct and usable in written English.
It can be used when discussing a strong justification or reasoning behind a decision, argument, or action.
Example: "The committee presented a powerful rationale for the proposed changes to the policy, emphasizing the benefits for all stakeholders."
Alternatives: "a compelling justification" or "a strong reasoning".
There is a powerful rationale behind this shift.
In itself, this is a powerful rationale for Hillary Clinton's candidacy.
This narrative of national decline provides a powerful rationale for the coalition's school reforms.
For example, GE's long-standing strategic principle of always being number one or number two in an industry offers a powerful rationale for how a conglomerate can create value but still give individual units considerable strategic freedom.
In a speech at the Kennedy Space Center in Florida on Thursday, Mr. Obama sought — personally — to win over his critics, offering a powerful rationale for his plan and some reasonable modifications.
The panel had a powerful rationale behind its proposal: many economists say the real estate subsidy is one of the tax code's most unfair features, overwhelmingly benefiting the affluent and pulling investment from the rest of the economy into the housing sector.
This is important, as the results of trial WV15799 formed part of the WHO 3 rationale for use of the drug to interrupt transmission from person to person and to allow time before the arrival of vaccines in the event of a pandemic, furnishing a seemingly powerful rationale for stockpiling oseltamivir.
That black voters are overwhelmingly registered as Democrats obviously offers a very powerful rationale for staying inside the confines of the party, whatever your views.
This excellent book develops an elegant and powerful rationale for international trade agreements: to resolve terms of trade externalities.
For Clinton, and other double-deathers, this combo has a powerful political rationale.
The board of Carillion, which maintains UK railways, roads and military bases, remains of the mind that there is a powerful strategic rationale for the deal that would create "very significant" shareholder value.
