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Step-5

Title: Ratio & Proportion

Grade: 8-a Lesson: S4-L8

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Step	Type	Explanation	Answer
1	Problem	Find the fourth proportion to 10 , 12 and 15.
2	Step	Let us take the third proportion is	\$x\$
3	Step	We can write the above numbers in the proportional form (a : b :: c : d)	\$10 : 12::x : 15 \$
4	Hint	\$a/b::c/d\$
5	Step	Here a = 10 , b = 12 , c = x & d = 15
6	Step	Let us find the x value	x = \$ (10 \times 15)/12\$ x = \$12.5\$
7	SumUp	Can you summarize what you’ve understood in the above steps?
8	Choice.A	Incorrect option. 16 does not satisfy proportionality	16
9	Choice.B	This is correct because it is the result of solving the proportion	12.5
10	Choice.C	Incorrect answer. 14 does not satisfy proportionality	14
11	Choice.D	Incorrect answer. 12 does not satisfy proportionality	12
12	Answer	Option	B
13	SumUp	Can you summarize what you’ve understood in the above steps?

Step

Type

Explanation

Answer

Problem

Find the fourth proportion to 10 , 12 and 15.

Step

Let us take the third proportion is

\$x\$

Step

We can write the above numbers in the proportional form
(a : b :: c : d)

\$10 : 12::x : 15 \$

Hint

\$a/b::c/d\$

Step

Here a = 10 , b = 12 , c = x & d = 15

Step

Let us find the x value

x = \$ (10 \times 15)/12\$

x = \$12.5\$

SumUp

Can you summarize what you’ve understood in the above steps?

Choice.A

Incorrect option. 16 does not satisfy proportionality

Choice.B

This is correct because it is the result of solving the proportion

12.5

Choice.C

Incorrect answer. 14 does not satisfy proportionality

Choice.D

Incorrect answer. 12 does not satisfy proportionality

Answer

Option

SumUp

Can you summarize what you’ve understood in the above steps?