Home / 330-485

Finding the Third Proportional to 330 and 485

Calculator

Solution

The third proportional to 330 and 485 is: 712.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    330 : 485 = 485 : x
  2. Step 2: Convert to fraction form
    330/485 = 485/x
  3. Step 3: Cross multiply
    330x = 485 × 485
  4. Step 4: Simplify right side
    330x = 235,225
  5. Step 5: Solve for x
    x = 235,225/330
  6. Step 6: Final answer
    x = 712.80

Related Problems

Find third proportional to 165 and 242.50
Half scale
Find third proportional to 660 and 970
Double scale
Find third proportional to 332 and 488
Similar ratio
Find third proportional to 495 and 727.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.