Question

find the value of x.
3:15::7:x​

Answer 1

Step-by-step explanation:

x is 15x7. We can split 15 into 5 x 3. Now all we have is 5x7.  That is 35 so therefore x is 35.

x = 15 x 7

5x3 is 15

cut out the 3

x=5x7

x = 35

Answer 2

To find : the value of $x$ .

Given  ratio : $3 : 15 : :7 : x$

Solution : as we can see that in the given ratio of proportion  $3 : 15 : :7 : x$

forth ratio is missing.

To find forth ratio we can write $3 : 15 : :7 : x$  

as,   $\frac{3}{15} = \frac{7}{x}$

transfering  like terms we get,

⇒   $x = \frac{15 \times 7}{3}$

on simplifying we get,

⇒  $x = 5 \times 7$

⇒ $x = 35$

Hence, value of $x$ is 35.