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Step-5

Title: Ratio & Proportion

Grade: 8-a Lesson: S2-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		Answer	B

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\$

Answer