Question
Determine if the following numbers are in proportion:
7, 42, 13, 78
7, 42, 13, 78
✓
Answer
7, 42, 13, 78
7 : 42 :: 13 : 78
If ad = bc if 7 × 78 = 42 × 13
If 546 = 546
Which is true
$\therefore$ 7, 42, 13, 78 are in proportion.
7 : 42 :: 13 : 78
If ad = bc if 7 × 78 = 42 × 13
If 546 = 546
Which is true
$\therefore$ 7, 42, 13, 78 are in proportion.
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