Home / 278,844-420,864

Finding the Third Proportional to 278,844 and 420,864

Calculator

Solution

The third proportional to 278,844 and 420,864 is: 635,217.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,844 : 420,864 = 420,864 : x
  2. Step 2: Convert to fraction form
    278,844/420,864 = 420,864/x
  3. Step 3: Cross multiply
    278,844x = 420,864 × 420,864
  4. Step 4: Simplify right side
    278,844x = 177,126,506,496
  5. Step 5: Solve for x
    x = 177,126,506,496/278,844
  6. Step 6: Final answer
    x = 635,217.21

Related Problems

Find third proportional to 139,422 and 210,432
Half scale
Find third proportional to 557,688 and 841,728
Double scale
Find third proportional to 278,846 and 420,867
Similar ratio
Find third proportional to 418,266 and 631,296
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.