Home / 279-480

Finding the Third Proportional to 279 and 480

Calculator

Solution

The third proportional to 279 and 480 is: 825.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    279 : 480 = 480 : x
  2. Step 2: Convert to fraction form
    279/480 = 480/x
  3. Step 3: Cross multiply
    279x = 480 × 480
  4. Step 4: Simplify right side
    279x = 230,400
  5. Step 5: Solve for x
    x = 230,400/279
  6. Step 6: Final answer
    x = 825.81

Related Problems

Find third proportional to 139.50 and 240
Half scale
Find third proportional to 558 and 960
Double scale
Find third proportional to 281 and 483
Similar ratio
Find third proportional to 418.50 and 720
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.72) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.