ICSE Class 10: Proportions Videos

• (a²+c²),(ab+cd) and (b²+d²) and in continued proportion, prove that a,b,c,d are in the proportuon
• if abc are in Continued proportion then prove that 3a2-4ab+5b2/3b2-4bc+5c2=a/c
• ?????????????????????using properties of proportion find the value of x : x?+1:2x?::313:25
  
• b is the main proportion between a and b prove a2-b2+C2/a-2-b-2+c-2=b4
  
• If y (3x- y) : x (4x+y) =5:12, find (x²+y²) : (x+y) ²
• what is the ratio and propotion
• what number should be added to each of these
  
• can you please explain this sum?
  
• If (7a+8b) (7c-8d) = (7a-8b) (7c+8d); then prove that a:b = c:d
• p,q,r,s in proportion then prove that  (p-r)q²/(q-s)rs=(p²-q²-pq)/(r²-s²-rd)    
  

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