Finding the Third Proportional to 1,320 and 1,490

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320 : 1,490 = 1,490 : x
2. Step 2: Convert to fraction form
   1,320/1,490 = 1,490/x
3. Step 3: Cross multiply
   1,320x = 1,490 × 1,490
4. Step 4: Simplify right side
   1,320x = 2,220,100
5. Step 5: Solve for x
   x = 2,220,100/1,320
6. Step 6: Final answer
   x = 1,681.89