I am, honestly, slightly confused by the question wording, so here is what I think you need! :D
We can start by listing multiplies for each:
3:
3, 6, 9, 12, 15, 18, etc
4:
4, 8, 12, 16, 20, 24, etct
We can see that the least common denominator will be 12.
Answer:
![(1)/(3)=(x)/(12)=(4)/(12)](https://img.qammunity.org/2022/formulas/mathematics/high-school/6h7ekx2c8ne4ueu834vc37wphzsvxhfdfq.png)
![(1)/(4) =(x)/(12) =(3)/(12)](https://img.qammunity.org/2022/formulas/mathematics/high-school/87qxdqolseh7jo2p6vf1zxgtfwm7tlvdcj.png)
If you need to multiply them:
![(4)/(12) *(3)/(12) = (12)/(144) = (1)/(12)](https://img.qammunity.org/2022/formulas/mathematics/high-school/7h0q1k6jjpz2sgi84zxhtzzg8q279giun9.png)
But you do not need to use a least common denominator for multiplying and can go straight to this:
![(1)/(3) *(1)/(4) =(1)/(12)](https://img.qammunity.org/2022/formulas/mathematics/high-school/y76nop3mdgw0navj3o1936ne4hcdp8l3ie.png)
Hope this helps, have a nice day!