Home / 128,212-280,550

Finding the Third Proportional to 128,212 and 280,550

Calculator

Solution

The third proportional to 128,212 and 280,550 is: 613,891.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,212 : 280,550 = 280,550 : x
  2. Step 2: Convert to fraction form
    128,212/280,550 = 280,550/x
  3. Step 3: Cross multiply
    128,212x = 280,550 × 280,550
  4. Step 4: Simplify right side
    128,212x = 78,708,302,500
  5. Step 5: Solve for x
    x = 78,708,302,500/128,212
  6. Step 6: Final answer
    x = 613,891.85

Related Problems

Find third proportional to 64,106 and 140,275
Half scale
Find third proportional to 256,424 and 561,100
Double scale
Find third proportional to 128,214 and 280,554
Similar ratio
Find third proportional to 192,318 and 420,825
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.