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Let 'p' be the number that must be added to each of the given numbers so that they become proportional.
i.e. (19 + p) :(25 + p) ::(43 + p) :(55 + p)
So, (19 + p) ÷ (25 + p) = (43 + p) ÷ (55 + p)
Or, (19 + p) (55 + p) = (43 + p) (25 + p)
Or, 1,045 + 19p + 55p + p 2 = 1,075 + 43p + 25p + p 2
Or, 1,045 + 74p = 1,075 + 68p
Or, 6p = 30
Or, 'p' = 5
Required value = p + 4 = 5 + 4 = 9
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