Home / 128,630-278,725

Finding the Third Proportional to 128,630 and 278,725

Calculator

Solution

The third proportional to 128,630 and 278,725 is: 603,961.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,630 : 278,725 = 278,725 : x
  2. Step 2: Convert to fraction form
    128,630/278,725 = 278,725/x
  3. Step 3: Cross multiply
    128,630x = 278,725 × 278,725
  4. Step 4: Simplify right side
    128,630x = 77,687,625,625
  5. Step 5: Solve for x
    x = 77,687,625,625/128,630
  6. Step 6: Final answer
    x = 603,961.95

Related Problems

Find third proportional to 64,315 and 139,362.50
Half scale
Find third proportional to 257,260 and 557,450
Double scale
Find third proportional to 128,632 and 278,729
Similar ratio
Find third proportional to 192,945 and 418,087.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.