Home / 300,122-640,420

Finding the Third Proportional to 300,122 and 640,420

Calculator

Solution

The third proportional to 300,122 and 640,420 is: 1,366,570.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    300,122 : 640,420 = 640,420 : x
  2. Step 2: Convert to fraction form
    300,122/640,420 = 640,420/x
  3. Step 3: Cross multiply
    300,122x = 640,420 × 640,420
  4. Step 4: Simplify right side
    300,122x = 410,137,776,400
  5. Step 5: Solve for x
    x = 410,137,776,400/300,122
  6. Step 6: Final answer
    x = 1,366,570.18

Related Problems

Find third proportional to 150,061 and 320,210
Half scale
Find third proportional to 600,244 and 1,280,840
Double scale
Find third proportional to 300,124 and 640,424
Similar ratio
Find third proportional to 450,183 and 960,630
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.