If a:b= 4:5, b:c= 2:3, c:d = 7:8 find a:b:c:d
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A:B:C:D= 56:70: 105:120
Step-by-step explanation:
A:B= 4:5，B:C= 2:3，C:D=7:8
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A:B=（4X14）:（5X14）= 56:70
B:C=（2X35）:（3x35）= 70:105
C:D=（7x15）:（8x15）= 105:120
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A:B:C:D= 56:70: 105:120
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