GlenCalc

Ratio calculator

Simplify a ratio, or scale it: if A is to B as C is to ?, find the missing number.

Your answer

D1,080
Proportion16 : 9 = 1,920 : 1,080

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How we worked it out

Updated as you change the numbers.

  1. D = B × C ÷ A = 9 × 1,920 ÷ 16.

Method and assumptions

In a proportion A:B = C:D the cross products are equal (A × D = B × C), so D = B × C ÷ A. A ratio is simplified by dividing both parts by their greatest common divisor.

Questions

What height is a 16:9 screen 1,920 pixels wide?

1,080 pixels.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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