The rich is getting richer. justify article 'The' here.

[Hamids]

The rich is getting richer. justify article 'The' here.

[Mister Micawber]

You have the expression wrong. It's 'The rich get richer'. The definite article is used because 'rich' is a noun, and it refers to a specific segment of society, as opposed to 'the poor' (who get poorer).
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Native English teacher at Mister Micawber's

[Esl_Expert]

The word "rich" is generally used as an adjective. However, in the sentence Hamids posted, the word "rich" is used as a plural noun.

Dictionary.com has a specific entry for this usage. See definition 19 in the following link:
http://dictionary.reference.com/browse/the+rich?r=66

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"It is only when the rich are sick that they fully feel the impotence of wealth." ~ Benjamin Franklin

[Sahid59]

..

can we say....' the wealthy get welthier day by day due to golbal trade implementations....' ?

...
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Sahid59

Better tomorrow with better English

[Haihao]

I would think you can grammatically but the original (the rich) is from the Bible.