find the fourth proportional to 21, 10, 84.
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find the fourth proportional to 21, 10, 84.
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[tex]\rm{~~~~⇒{\frac{21}{10} = {\frac{84}{x}}}}[/tex]
[tex]\rm{~~~~⇒21x = 10 ×84}[/tex]
[tex]\rm{~~~~⇒x = {\frac{(10 × 84)} {21}}}[/tex]
[tex]\rm{~~~~⇒x = 40}[/tex]
Answer:
21:10::84:x
21xx:84×10
21x:840
x=840/21
x=120/3
x=40
the fourth proportional to 21 ,10 ,84 is 40
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