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Question: Solve the proportion a4 = 79 using the property of cross multiplication.


A ) 59
B ) 2823
C ) 289
D ) 928

Steps to derive

 [Write a proportion.]
1 a4 = 79

 [Cross multiply.]
2 a × 9 = 4 × 7

 [Divide each side by 9.]
3 a × 99 = 4 × 79

 [Simplify.]
4 a = 289



Hence the right answer is Option C

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