find x when 4:7 = x:5?

Question

this is a maths question. i don't know how to do this question. this question is on ratio and proportion. this is a secondary 1 subject.

Answer 1

20/7

Answer 2

x = 5*4/7=20/7

Answer 3

x=20/7

Answer 4

x=20/7

Answer 5

its 20:7

Answer 6

Arrange the ratios,

4 : 7
x : 5

Cross multiply,

(4) (5) = (7) x

7x = 20

x = 20/7

Answer 7

to isolate x it is easiest when it is on top of the fraction like it is. That being done, you can get the 5 out from under the x by putting it on top on both sides, and it becomes x= (original fraction on left hand side)(5)
since the fraction is multiplied by the 5, it multiplies with the 4, then the result gets divided by the 7 to find out what x is
so when you have something on the bottom of a fraction, it has to be multiplies through on both sides to isolate what is on top.
If you had x on the bottom, you would have had to multiply both sides by x to isolate it. like this
5:x=4:7
x(5:x)=(4:7)(x)
5=(4:7)(x)
(5)(7:4)=x
it is a bit more complicating bc you have to get x on the top of the fraction.
remember, when a fraction crosses the equal sign it is inverted, which is the sam as multiplying both sides by its reciprocal, or the same fraction upsidedown

Answer 8

The answer is 20/7.

Answer 9

Hi, you can convert into fractions and work out. Here is how:

4/7 = x/5
x = (4/7) * 5
= 20/7 (answer)

Answer 10

Alright, proportions are easier if you rewrite them to solve them.
what you should do is re- write the problem so that it is:

4/7 = x/5

from there you cross multiply to get

20=7x

then you isolate the x on one side by dividing out that pesky 7

20/7=x

which is 2.86 in decimal form rounded up