Home / 128,796-280,475

Finding the Third Proportional to 128,796 and 280,475

Calculator

Solution

The third proportional to 128,796 and 280,475 is: 610,781.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,796 : 280,475 = 280,475 : x
  2. Step 2: Convert to fraction form
    128,796/280,475 = 280,475/x
  3. Step 3: Cross multiply
    128,796x = 280,475 × 280,475
  4. Step 4: Simplify right side
    128,796x = 78,666,225,625
  5. Step 5: Solve for x
    x = 78,666,225,625/128,796
  6. Step 6: Final answer
    x = 610,781.59

Related Problems

Find third proportional to 64,398 and 140,237.50
Half scale
Find third proportional to 257,592 and 560,950
Double scale
Find third proportional to 128,798 and 280,479
Similar ratio
Find third proportional to 193,194 and 420,712.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.