3.2 proportions

# 3.2 proportions - Final answer as a fraction 9 4 : 8 5 t :...

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3.2 Proportions

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PROPORTIONS PROPORTIONS: Statement that TWO ratios are equal 1 : 2 = 2 : 4 x : 2 = 7 : 5 SOLVING PROPORTIONS WITH 1 UNKNOWN Solve for x if: x : 2 = 7 : 5 STEP 1: STEP 2: Change proportion to FRACTIONAL form Crossmultiply 5 7 2 X = 7 2 5X × = 5 14 = X 8 2 . = STEP 3: Solve for x
PROPORTIONS SOLVING PROPORTIONS WITH 2 UNKNOWNS STEP 2: STEP 3: Change proportion to fractions Crossmultiply 6.5 X 13 3 = 6.5 3 X 13 × = 13 19.5 = X Solve for X and Y if: 3 : 4 : 13 = x : y : 6.5 STEP 1: Write as 2 proportions 3 : 13 = X: 6.5 4 :13 = Y : 6.5 6.5 Y 13 4 = 6.5 4 13Y × = 13 26 = Y 5 . X 1 = 2 = Y STEP 4: Solve for X and Y

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A proportion is: 25% 25% 25% 25% A. A ratio B. One ratio multiplied by another ratio C. One ratio divided by another ratio D. A statement that 2 ratios are equal
Solve for p in the following proportion: 2.17 : 1.61 = p : 4.6 25% 25% 25% 25% A. 3.41 B. 34.1 C. 6.20 D. 62.0

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Solve for p in the following proportion: 2.17 : 1.61 = p : 4.6 4.6 p 1.61 2.17 = 61 . 1 6 . 4 17 . 2 p 6 . 4 17 . 2 61 . 1 p × = × = × p 2 6 = . 2 6 p . =
Solve for t in the following proportion:

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Unformatted text preview: Final answer as a fraction 9 4 : 8 5 t : 4 3 = 9 4 8 5 4 3 = t 5 8 x 9 4 x 4 3 t = 9 4 8 5 × = × 4 3 t 180 96 t = 15 8 t = A manufacturing process requires \$85 supervision cost for every 64 labour hours. At the same rate, how much supervision cost should be budgeted for 16,000 labour hours? 25% 25% 25% 25% A. \$12,047 B. \$17,975 C. \$21,250 D. \$23,329 A manufacturing process requires \$85 supervision cost for every 64 labour hours. At the same rate, how much supervision cost should be budgeted for 16,000 labour hours? COST:HOURS 16,000 : X 64 : 85 = X 64 85 000 , 16 = 64 000 , 16 85 X 000 , 16 85 X 64 × = × = 250 , 21 X = Therefore, \$21,250 in supervision cost should be budgeted for 16,000 labour hours HOMEWORK: Ex. 3.2, pg. 106: A) odd B) 1, 3 LAB 4 # 5 - 9 ***End of LAB 4***...
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## This note was uploaded on 10/04/2011 for the course MATH 1175 taught by Professor Jenny during the Spring '10 term at Fanshawe.

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3.2 proportions - Final answer as a fraction 9 4 : 8 5 t :...

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