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8,12,16 and 20
Step-by-step explanation:
Let the four parts be (a – 3d), (a – d), (a + d) and (a + 3d).
Then, sum = 56
⇒ (a – 3d) + (a – d) + (a + d) + (a + 3d) = 56
⇒ 4a = 56
⇒ a = 14
it is given that;
(a-3d) (a+3d)/(a+d) (a-d) =5/6
⇒a² -9d²/a² - d² = 5/6
⇒(14)² - 9d² / (14)² -d²= 5/6 (putting value of a)
⇒196-9d²/196-d²=5/6
⇒1176 - 54d²=980- 5d²
⇒1176-980=54d²-5d²
⇒ 49d²= 196
⇒d²= 4
⇒d=±2
thus, the four parts are a – 3d, a – d, a + d, a + 3d i.e., 8, 12, 16 and 20.
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