Home / 128,420-191,270

Finding the Third Proportional to 128,420 and 191,270

Calculator

Solution

The third proportional to 128,420 and 191,270 is: 284,879.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,420 : 191,270 = 191,270 : x
  2. Step 2: Convert to fraction form
    128,420/191,270 = 191,270/x
  3. Step 3: Cross multiply
    128,420x = 191,270 × 191,270
  4. Step 4: Simplify right side
    128,420x = 36,584,212,900
  5. Step 5: Solve for x
    x = 36,584,212,900/128,420
  6. Step 6: Final answer
    x = 284,879.40

Related Problems

Find third proportional to 64,210 and 95,635
Half scale
Find third proportional to 256,840 and 382,540
Double scale
Find third proportional to 128,422 and 191,273
Similar ratio
Find third proportional to 192,630 and 286,905
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.