Home / 128,658-278,784

Finding the Third Proportional to 128,658 and 278,784

Calculator

Solution

The third proportional to 128,658 and 278,784 is: 604,086.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,658 : 278,784 = 278,784 : x
  2. Step 2: Convert to fraction form
    128,658/278,784 = 278,784/x
  3. Step 3: Cross multiply
    128,658x = 278,784 × 278,784
  4. Step 4: Simplify right side
    128,658x = 77,720,518,656
  5. Step 5: Solve for x
    x = 77,720,518,656/128,658
  6. Step 6: Final answer
    x = 604,086.17

Related Problems

Find third proportional to 64,329 and 139,392
Half scale
Find third proportional to 257,316 and 557,568
Double scale
Find third proportional to 128,660 and 278,788
Similar ratio
Find third proportional to 192,987 and 418,176
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.