Question
Show that 30, 40, 45, 60 are in proportion.
✓
Answer
We know that a, b, c, d are in proportion if ad = bc
Now 30, 40, 45, 60 are in proportion
if 30 × 60 = 40 × 45
if 1800 = 1800
which is true
30, 40, 45, 60 are in proportion.
Now 30, 40, 45, 60 are in proportion
if 30 × 60 = 40 × 45
if 1800 = 1800
which is true
30, 40, 45, 60 are in proportion.
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