5. The first three terms of a proportion are 12, 21 and 8 respectively. Then 4 term is
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Step-by-step explanation:
Let the 4th term be x.
= 12 : 21 : : 8 : x
= 24 * x = 21 * 8
= 24x = 168
= x = 7.
Hence, the 4th proportion is 7.
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