Answer: 0.89
Explanation:
The total portfolio beta is a weighted average of the constituent security betas.
145,000 + 58,000 = $203,000
The total portfolio beta of 203,000 should have a beta of 1.19.
Proportion of New investment = 58,000/203,000
= 28.57%
Proportion of old portfolio = 145,000/203,000
= 71.43%
(0.7143 * 1.31) + (0.2857 * x) = 1.19
0.9357 + 0.2857x = 1.19
0.2857x = 0.2543
x= 0.89