Question

The first , second and third terms in a proportion are 51 ,85 and 57. Find the 4th term​

Answer 1

Step-by-step explanation:

let the fourth proportion be x

51 : 85:: 57 : x

priduct of extermes = product of means

x × 51 = 85 × 57

x = 85 × 57

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51

with the table of 17 , 85 and 51 can be cut to get 5 and 3

3 can be cancelled with 57 to get 19

now ,

19 × 5 = 95 is the answer