Home / 128,146-280,430

Finding the Third Proportional to 128,146 and 280,430

Calculator

Solution

The third proportional to 128,146 and 280,430 is: 613,682.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,146 : 280,430 = 280,430 : x
  2. Step 2: Convert to fraction form
    128,146/280,430 = 280,430/x
  3. Step 3: Cross multiply
    128,146x = 280,430 × 280,430
  4. Step 4: Simplify right side
    128,146x = 78,640,984,900
  5. Step 5: Solve for x
    x = 78,640,984,900/128,146
  6. Step 6: Final answer
    x = 613,682.71

Related Problems

Find third proportional to 64,073 and 140,215
Half scale
Find third proportional to 256,292 and 560,860
Double scale
Find third proportional to 128,148 and 280,434
Similar ratio
Find third proportional to 192,219 and 420,645
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.