Home / 256,239-398,118

Finding the Third Proportional to 256,239 and 398,118

Calculator

Solution

The third proportional to 256,239 and 398,118 is: 618,555.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,239 : 398,118 = 398,118 : x
  2. Step 2: Convert to fraction form
    256,239/398,118 = 398,118/x
  3. Step 3: Cross multiply
    256,239x = 398,118 × 398,118
  4. Step 4: Simplify right side
    256,239x = 158,497,941,924
  5. Step 5: Solve for x
    x = 158,497,941,924/256,239
  6. Step 6: Final answer
    x = 618,555.11

Related Problems

Find third proportional to 128,119.50 and 199,059
Half scale
Find third proportional to 512,478 and 796,236
Double scale
Find third proportional to 256,241 and 398,121
Similar ratio
Find third proportional to 384,358.50 and 597,177
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.