Determine if the following ratios form a proportion. Also, write the middle terms and extreme terms where the ratios from a proportion. $200$mL $:2.5$ litre and Rs. $4$: Rs. $50$.

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$200$mL $:2.5$l and Rs. $4:$ Rs. $50$ $1l=1000$mL $2.5l=2500$mL $2500200 =252 $ and $504 =252 $ Yes. These are in proportion Middle terms are $2.5l,$ Rs. $4$. Extreme terms are $20$mL, Rs. $50$.