Home / 275,390-420,999

Finding the Third Proportional to 275,390 and 420,999

Calculator

Solution

The third proportional to 275,390 and 420,999 is: 643,596.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,390 : 420,999 = 420,999 : x
  2. Step 2: Convert to fraction form
    275,390/420,999 = 420,999/x
  3. Step 3: Cross multiply
    275,390x = 420,999 × 420,999
  4. Step 4: Simplify right side
    275,390x = 177,240,158,001
  5. Step 5: Solve for x
    x = 177,240,158,001/275,390
  6. Step 6: Final answer
    x = 643,596.93

Related Problems

Find third proportional to 137,695 and 210,499.50
Half scale
Find third proportional to 550,780 and 841,998
Double scale
Find third proportional to 275,392 and 421,002
Similar ratio
Find third proportional to 413,085 and 631,498.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.