Answer :

Numbers a, b, c, d are said to be in proportion if



(1) Here,


a = 28, b = 16, c = 21, d = 12



On dividing numerator and denominator by 4 gives,



Now,



On dividing numerator and denominator by 3 gives,



From (i) and (ii)




28, 16, 21, 12 are in proportion


2) Here,


a = 12, b = 32, c = 15, d = 35



On dividing numerator and denominator by 4 gives,



Now,



On dividing numerator and denominator by 5 gives,



From (i) and (ii)



12, 32, 15, 35 are not in proportion


(3) Here,


a = 39, b = 26, c = 57, d = 38



On dividing numerator and denominator by 13 gives,



Now,



On dividing numerator and denominator by 19 gives,



From (i) and (ii)



39, 26, 57, 38 are in proportion


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