Washington ? Americans are recovering their shrunken wealth — gradually.

Household net worth rose last quarter, mainly because the healing economy boosted stock portfolios. But the gain was slight. And it was less than in the previous two quarters.

The Federal Reserve said Thursday that net worth rose 1.3 percent in the fourth quarter to $54.2 trillion. It marked the third straight quarter of gains. But economists say consumers would need a stronger and more prolonged increase in their wealth to persuade them to ratchet up spending.

Net worth had risen by a more robust 4.5 percent in the second quarter of 2009 and an even faster 5.5 percent in the third quarter. Net worth is the value of assets such as homes, checking accounts and investments minus debts like mortgages and credit cards.