If 6, 18, 39, and x are in proportion, then find the value of x.

Correct option is A

Given:

6, 18, 39, and x are in proportions

Formula Used:

If a,b,c,d are in proportion

Then ,

​$$\frac{a}{b} =\frac{c}{d} \ or\ a\times d= b\times c$$​​

Solution:

​$$a\times d= b\times c$$​​

​$$6\times x= 18\times 39$$​​

​$$x= \frac{18\times 39}{6}$$​​

= 117