Proportionality Law

Q.

State the following ratios are in proportion or not: $15:18and10:12$.

Q. Find the missing values in the following table of equivalent ratios.

$2$	$x$	$6$	$8$
$7$	$14$	$y$	$28$

1. $x=6;y=21$
2. $x=8;y=24$
3. $x=6;y=21$
4. $x=4;y=21$

Q.

State the following ratios are in proportion or not: $25:40and20:32$.

Q.

If the first three terms of a proportion are $9,8$ and $54$ respectively, find the fourth term.

Q.

If the ratios formned using the numbers 6, $x$, 25 , 75 in the same order are in proportion, then '$x$' is ___

1. 5

2. 18

3. 50

4. 24

Q. If 1 : x :: y : 2 Which of the following statements is true ?

1. $\frac{x}{y}=2$
2. $xy=4$
3. $xy=2$
4. $\frac{y}{x}=2$

Q. The value of x in 1:1=2:x is 2.

1. False
2. True

Q.

State the following ratios are in proportion or not: 15:18 and 9:12

Q. If x : 2 :: y : 4 are in proportion, then which of the following equations is true?

1. $x=8y$
2. $x=4y$
3. $2x=y$
4. $x=2y$

Q. Sort in ascending order based on the value of x. (Smallest value of x on the top.)

1. 3 : 3 = x : 1
2. 1 : 2 = 1 : x
3. x : 6 = 1 : 2
4. x : 16 = 1 : 4

Q.

Which of the ratios form a proportion $?$

1. $5$ to $2$and $4$to $10$

2. $2:3$ to $7:8$

3. $3$ to $2$ and $15$ to $10$

4. $12:8$ and $8:42$

Q.

State the following ratios are in proportion or not: $12:15and8:12$.

Q. If 2 : 9 :: x : 18, then the value of x is

1. 4
2. 8
3. 10

Q. If, a:b :: c:d, then,

1. ac = bd
2. ab = cd
3. ad = bc
4. abc = bd

Q.

Find the value of $x$ so that the given numbers are in proportion

$x:5::15:25$

1. 4

2. 3

3. 5

4. 2

Q. If 4 : 2 = 62 : x, then the value of x is .

1. 33
2. 31
3. 30

Q.

If $2:9::x:18,$ then find the value of $x.$

1. 4

2. 8

3. 10

4. 12

Q. In the given two proportions, x : 2 :: 2 : 1 and y : 3 :: 2 : 3, which of the following statements is/are true ?

1. x = 4
2. y = 1
3. x - y = 3
4. x + y = 6

Q.

Determine if the ratios are in proportion

$1150ml:250ml::3150ml:300ml$