Since 1 Indian Rupee is equal to 4.64153638823 Sri Lankan Rupees, we could say that n Indian Rupees are equal to 4.64153638823 times n Sri Lankan Rupees. In other words, we could use the following formula:
Sri Lankan Rupees = Indian Rupees x 4.64153638823
For example, let's say that we want to convert 2 Indian Rupees to Sri Lankan Rupees. Then, we just replace Indian Rupees in the abovementioned formula with 2:
Sri Lankan Rupees = 2 x 4.64153638823
That is, 2 Indian Rupees are equal to 9.28307277646 Sri Lankan Rupees.