Home / 206,387-421,521

Finding the Third Proportional to 206,387 and 421,521

Calculator

Solution

The third proportional to 206,387 and 421,521 is: 860,906.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,387 : 421,521 = 421,521 : x
  2. Step 2: Convert to fraction form
    206,387/421,521 = 421,521/x
  3. Step 3: Cross multiply
    206,387x = 421,521 × 421,521
  4. Step 4: Simplify right side
    206,387x = 177,679,953,441
  5. Step 5: Solve for x
    x = 177,679,953,441/206,387
  6. Step 6: Final answer
    x = 860,906.71

Related Problems

Find third proportional to 103,193.50 and 210,760.50
Half scale
Find third proportional to 412,774 and 843,042
Double scale
Find third proportional to 206,389 and 421,525
Similar ratio
Find third proportional to 309,580.50 and 632,281.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.