Home / 319,728-648,420

Finding the Third Proportional to 319,728 and 648,420

Calculator

Solution

The third proportional to 319,728 and 648,420 is: 1,315,019.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,728 : 648,420 = 648,420 : x
  2. Step 2: Convert to fraction form
    319,728/648,420 = 648,420/x
  3. Step 3: Cross multiply
    319,728x = 648,420 × 648,420
  4. Step 4: Simplify right side
    319,728x = 420,448,496,400
  5. Step 5: Solve for x
    x = 420,448,496,400/319,728
  6. Step 6: Final answer
    x = 1,315,019.32

Related Problems

Find third proportional to 159,864 and 324,210
Half scale
Find third proportional to 639,456 and 1,296,840
Double scale
Find third proportional to 319,730 and 648,424
Similar ratio
Find third proportional to 479,592 and 972,630
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.