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Length of the rectangular park$=4x$ and Breadth of the rectangular park$=3x$

Area of the rectangular park$=l×b$

$⇒1728=4x×3x$

$⇒12x_{2}=1728$

$⇒x_{2}=121728 =144$

$⇒x=12$ m

$∴$ sides of the rectangular park are

Length of the rectangular park$=4x=4×12=48$ m and

Breadth of the rectangular park$=3x=3×12=36$ m

$∴$ Perimeter of the land$=2(l+b)=168$m

Cost of fencing a land per meter$=$Rs.$30$

Cost of fencing a land of $168$m$=$Rs.$30×168=$Rs.$5,040$

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