Making the right NPK | Miscellaneous | Hydroponics farming in India

Hello,

I have taken by gardening 6 months ago.I currently have 7 hibiscus.The flower size was very big when I initially purchased them..later(couple of weeks after)  the size has reduced. I have planted these plants in a pot containing compost+Coco peat+Red Soil in equal parts.

It is very hard to get a  17:5:24 Fertilizer(This is the best ratio for Hibiscus –Source http://www.hiddenvalleyhibiscu.....eeding.htm ) . Request you to  help me out in making this ratio with the options available with me.

I have

1. 25:10:15 (Dosage on label -2 grams/Litre)
2. 13:0:44(Dosage on Label 8-10 grams/Litre).

I initially thought that If I were to mix these two in equal quantities I would end up with 19:5:29(Is my understanding correct?).I am skeptical on  my logic when I have noticed that these two fertilizers had different dosage rates.Can you please help me on this one.

Appreciate your help.

Bhavani