Question

a,b,c,d are in aproportion

Answer 1

Step-by-step explanation:

ad=bc

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