Home / 128,259-278,420

Finding the Third Proportional to 128,259 and 278,420

Calculator

Solution

The third proportional to 128,259 and 278,420 is: 604,384.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,259 : 278,420 = 278,420 : x
  2. Step 2: Convert to fraction form
    128,259/278,420 = 278,420/x
  3. Step 3: Cross multiply
    128,259x = 278,420 × 278,420
  4. Step 4: Simplify right side
    128,259x = 77,517,696,400
  5. Step 5: Solve for x
    x = 77,517,696,400/128,259
  6. Step 6: Final answer
    x = 604,384.07

Related Problems

Find third proportional to 64,129.50 and 139,210
Half scale
Find third proportional to 256,518 and 556,840
Double scale
Find third proportional to 128,261 and 278,424
Similar ratio
Find third proportional to 192,388.50 and 417,630
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.