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 $30 \times 60 = 40 \times 45$
if $1800 = 1800$ which is true $30, 40, 45, 60$ are in proportion.
Now $30, 40, 45, 60$ are in proportion if $30 \times 60 = 40 \times 45$
if $1800 = 1800$ which is true $30, 40, 45, 60$ are in proportion.
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