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Answer:
Let the number added be x
Then for all the numbers to be in proportion,
(7+x)/(4+x)=(22+x)/(14+x)
→(7+x)(14+x)=(22+x)(4+x)
→98+x^2+7x+14x=88+22x+4x+x^2
→98+21x=88+26x
→5x=10
→x=2
So the number to be added is 2
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