In the examples the green text indicates user entries and the blue text indicates the results. The A, B, C, D indicate the entry positions as in the Proportions Calculator app and as shown on its icon.

 

1. Image resize

Resize a 3264x2448 pixel image taken on an 8 megapixel camera to fit on a website where there is room for the image to be 216 pixels tall.

A = 3264 (width)
B = 2448 (height)
C = result
D = 216 (desired height)

3264288
2448216

2. Video size reduction

Reduce a 1080i video to standard definition width.

A = 1920 (width)
B = 1080 (height)
C = 720 (desired width)
D = result

1920720
1080405

3. Find tip amount

For a $48.40 dinner find the 15% tip amount.

A = 15 (tip %)
B = 100 (%)
C = result
D = 48.40 (dinner amount)

157.26
10048.40

4. Calculate sales tax amount

Calculate the 7.5% sales tax amount for a $32.40 purchase.

A = 7.5 (tax %)
B = 100 (%)
C = result
D = 32.40 (purchase amount)

7.52.43
10032.40

5. Scale a recipe

If 2 1/2 cups of pancake mix makes 8 pancakes how much mix is needed for 12 pancakes.

A = 8 (# pancakes)
B = 2.5 (cups of mix)
C = 12 (needed # pancakes)
D = result

812
2.53.75

6. Convert currency

Convert U.S. $24 to British Pounds with an exchange rate of 0.66.

A = .66 (exchange rate)
B = 1
C = result
D = 24 (U.S. dollars)

.6615.84
124

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