Balloon mortgages are short-term loans that begin with a series of fixed payments and end with a final, lump-sum payment. That one-time payment is called a balloon payment because it's often at least twice as much as the previous ones, leaving many borrowers with a final bill for tens of thousands of dollars (or more).
The PMT function in Excel determines the total payment owed each period—inclusive of the interest and principal payment. The total payment, unlike the other two components, will remain constant over the entire borrowing term.
Firstly, measure the dimensions of the balloon, such as its radius or diameter. The volume of a balloon can be approximated as that of a sphere, so you can use the formula for the volume of a sphere to calculate it. The formula is V = (4/3)πr³, where V represents the volume and r denotes the radius.