Question

4. Find the third proportional to :
Rs 1.60 and Rs 0.40
plz answer fast
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Answer 1

Answer:

Step-by-step explanation:

1.6/0.4 *3/3= 4.8/1.2

Answer 2

Answer:

Hence, the third proportional to Rs. 1.60 and Rs. 0.40 is Rs. 0.1.

Let two ratios be a:b and b:c. Then in these two ratios ‘a’ is the third proportional. So the third proportional is the uncommon term.

The third proportional to a ratio a : b is the number x such that ab=bx or ba=xb.

(i) 36 and 18

Let us assume the third proportional to be x. Then,

1836=x18

By simplifying this, we get

⇒12=x18⇒x=182⇒x=9

Hence, 9 is the third proportional to 36 and 18.

(ii) 5.25 and 7

Let us assume the third proportional to be x. Then,

75.25=x7

On simplifying this, we get

⇒43=x7⇒x=283

Hence, the third proportional to 5.25 and 7 is 283.

(iii) Rs. 1.60 and Rs.0.40

Let us assume the third proportional to be Rs. x. Then,

0.401.60=x0.4

On simplifying this, we get

⇒x0.4=14⇒x=0.1

Hence, the third proportional to Rs. 1.60 and Rs.0.40 is Rs.0.1.