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Three numbers are to one another 2:3:4. The sum of their cubes is 0.334125. Find the numbers.
Given:
Three numbers are to one another 2:3:4. The sum of their cubes is 0.334125.
To find:
We have to find the numbers.
Solution:
Let the numbers be $2a, 3a$ and $4a$
This implies,
$(2a)^3+ (3a)^3+(4a)^3 = 0.334125$
$8a^3+27a^3+64a^3 = 0.334125$
$99a^3 = 0.334125$
$99a^3 = \frac{334125}{1000000}$
$a^3=\frac{334125}{1000000\times99}$
$a^3= \frac{3375}{1000000}$
$a=\sqrt[3]{\frac{3375}{1000000}}$
$a=\frac{\sqrt[3]{(15\times15\times15)}} {\sqrt[3]{(100\times100\times100)}}$
$a= \frac{15}{100}$
$a= 0.15$
$2a=2(0.15)=0.3$
$3a=3(0.15)=0.45$
$4a=4(0.15)=0.6$
Therefore,
The numbers are $0.3, 0.45$ and $0.6$.
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