Home / 285-720

Finding the Third Proportional to 285 and 720

Calculator

Solution

The third proportional to 285 and 720 is: 1,818.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    285 : 720 = 720 : x
  2. Step 2: Convert to fraction form
    285/720 = 720/x
  3. Step 3: Cross multiply
    285x = 720 × 720
  4. Step 4: Simplify right side
    285x = 518,400
  5. Step 5: Solve for x
    x = 518,400/285
  6. Step 6: Final answer
    x = 1,818.95

Related Problems

Find third proportional to 142.50 and 360
Half scale
Find third proportional to 570 and 1,440
Double scale
Find third proportional to 287 and 725
Similar ratio
Find third proportional to 427.50 and 1,080
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.