Question

1. If a, b, c and d are in proportion, then:​

Answer 1

Answer:

ad=bc

Step-by-step explanation:

Proportion is equality of two ratios

The ratio of 2 to 3 is same as the ratio of 4 to 6 i.e

 

2:3 = 4:6

Therefore, the two ratios 2:3 and 4:6 are proportionate and written as

2:3 :: 4:6 are read as

the ratio of  2 to 3 is same as that of 4: 6

If 2:3 = 4:6 ,then

2×6=3×4 i.e 12=12

Let two ratios a:b and c:d be proportionate,

i.e a:b :: c:d

In the proportion a:b :: c:d

Product of means = product of extremes.

If a:b = c:d then

a×d = b×c

Answer 2

Answer:Proportion is equality of two ratios

Step-by-step explanation:Solution

verified

Verified by Toppr

Correct option is B)

Proportionisequalityoftworatios.

Theratioof2to3issameastheratioof4to6,i.e.

2:3=4:6

Therefore,thetworatios2:3and4:6areproportionateandwrittenas:

2:3::4:6andreadas

Theratioof2to3issameasthatof4to6.

If2:3=4:6,then

2×6=3×4,i.e.12=12,

Lettworatiosa:bandc:dbeproportionate,

i.e.a:b::c:d

Intheproportiona:b::c:d

Productofmeans=productofextremes.

Ifa:b=c:d,then

a×d=b×c