1. Simplify the ratio :
16 cm/4 m
2. Simplify the ratio :
12 ft/24 in.
3. The perimeter of rectangle PQRS shown below is 60 centimeters. The ratio of PQ : QR is 3 : 2. Find the length and width of the rectangle.
4. The ratios of the side lengths of ΔABC to the corresponding side lengths of ΔPQR are 2 : 1. Find the unknown lengths.
5. The measure of the angles in ABC are in the extended ratio of 1 : 2 : 3. Find the measures of the angles.
6. Solve the proportion :
6/x = 12/5
7. Solve the proportion :
3/(p + 2) = 2/p
8. The photo below shows a painting. The actual painting is 12 inches high. How wide is it ?
1. Answer :
To simplify ratios with unlike units, convert to like units so that the units divide out. Then simplify the fraction, if possible.
16 cm/4 m = 16 cm/4 ⋅ 100 cm
16 cm/4 m = 16 cm/400 cm
16 cm/4 m = 16/400
16 cm/4 m = 1/25 or 1 : 25
2. Answer :
The given two quantities are in different units.
That is, the first one is in feet and the second in inches.
As we did in the first example, we can convert them into like units and then simplify the fraction, if possible.
12 ft/24 in. = 12 ⋅ 12 in./24 in.
12 ft/24 in. = 144 in./24 in.
12 ft/24 in. = 144/24
12 ft/24 in. = 6/1 or 6 : 1
3. Answer :
Because the ratio of PQ : QR is 3 : 2, we can represent the length PQ as 3x and the width QR as 2x.
2l + 2w = p
Substitute l = 3x and w = 2x.
2(3x) + 2(2x) = 60
Simplify.
6x + 4x = 60
10x = 60
Divide both sides by 10.
x = 6
length = 3 ⋅ 6 = 18 cm
width = 2 ⋅ 6 = 12 cm
Hence, rectangle PQRS has a length of 18 centimeters and a width of 12 centimeters.
4. Answer :
From the given information and the diagram shown above, we can consider the following points.
AB is twice PQ and AB = 8, so PQ = 1/2 ⋅ 8 = 4 in.
Using the Pythagorean Theorem, we can determine that QR = 5.
AC is twice PR and PR = 3, so AC = 2 ⋅ 3 = 6 in.
BC is twice QR and QR = 5, so BC = 2 ⋅ 5 = 10 in.
5. Answer :
Begin by sketching a triangle. Then use the extended ratio of 1 : 2 : 3 to label the measures of the angles as x°, 2x°, and 3x°.
By Triangle Sum Theorem,
x° + 2x° + 3x° = 180°
x + 2x + 3x = 180
Simplify.
6x = 180
Divide both sides by 6.
x = 30
x° = 30°
2x° = 2 ⋅ 30° = 60°
3x° = 3 ⋅ 30° = 90°
Hence, the angle measures are 30°, 60° and 90°.
6. Answer :
Write the original proportion.
6/x = 12/5
By reciprocal property, we have
x/6 = 5/12
Multiply each side by 6.
6(x/6) = (5/12)6
Simplify.
x = 5/2
7. Answer :
Write the original proportion.
3/(p + 2) = 2/p
By cross product property, we have
3p = 2(p + 2)
3p = 2p + 4
Subtract 2p from both sides.
p = 4
8. Answer :
We can reason that in the photograph all measurements of the artist’s painting have been reduced by the same ratio.
That is, the ratio of the actual width to the reduced width is equal to the ratio of the actual height to the reduced height.
The photograph is 1¼ inches by 4⅜ inches.
Problem Solving Strategy :
Multiply each side by 4.375
4.375(x/4.375) = (12/1.25)4.375
Simplify.
x = (12/1.25)4.375
x = 42
So, the actual painting is 42 inches wide.
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