Home / 128,980-280,985

Finding the Third Proportional to 128,980 and 280,985

Calculator

Solution

The third proportional to 128,980 and 280,985 is: 612,130.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,980 : 280,985 = 280,985 : x
  2. Step 2: Convert to fraction form
    128,980/280,985 = 280,985/x
  3. Step 3: Cross multiply
    128,980x = 280,985 × 280,985
  4. Step 4: Simplify right side
    128,980x = 78,952,570,225
  5. Step 5: Solve for x
    x = 78,952,570,225/128,980
  6. Step 6: Final answer
    x = 612,130.33

Related Problems

Find third proportional to 64,490 and 140,492.50
Half scale
Find third proportional to 257,960 and 561,970
Double scale
Find third proportional to 128,982 and 280,989
Similar ratio
Find third proportional to 193,470 and 421,477.50
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.