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If 256, K, K, 81 are in proportion, and K is positive.
$$K \times K = 256\times81$$
$$K^2=16^2\times9^2$$ [There are two possible values of 'K'. One is positive and another one is negative. But the negative value of 'K' is not possible as per the information given in the question.]
K = $$16\times9$$
= 144
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