find the third proportional of 4 and 2.8
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The third proportional of two numbers a and b is defined to be that number c such that a : b = b : c. So you want to find a number c such that 12 : 18 = 18 : c. That number is 27. If BD = AC, then the 3rd proportional to AB and AC is CE.
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Answer:
1.96
Step-by-step explanation:
The third proportional of two numbers a and b is defined to be that number c such that a : b = b : c. So you want to find a number c such that 4 : 2.8 = 2.8 : c.
b² = ac
c = b²/a
c = 7.84/4
= 1.96
hence the third proportional of 4 and 2.8 is 1.96
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