Home / 128,418-199,621

Finding the Third Proportional to 128,418 and 199,621

Calculator

Solution

The third proportional to 128,418 and 199,621 is: 310,303.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,418 : 199,621 = 199,621 : x
  2. Step 2: Convert to fraction form
    128,418/199,621 = 199,621/x
  3. Step 3: Cross multiply
    128,418x = 199,621 × 199,621
  4. Step 4: Simplify right side
    128,418x = 39,848,543,641
  5. Step 5: Solve for x
    x = 39,848,543,641/128,418
  6. Step 6: Final answer
    x = 310,303.41

Related Problems

Find third proportional to 64,209 and 99,810.50
Half scale
Find third proportional to 256,836 and 399,242
Double scale
Find third proportional to 128,420 and 199,624
Similar ratio
Find third proportional to 192,627 and 299,431.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.