Home / 128,915-199,206

Finding the Third Proportional to 128,915 and 199,206

Calculator

Solution

The third proportional to 128,915 and 199,206 is: 307,823.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,915 : 199,206 = 199,206 : x
  2. Step 2: Convert to fraction form
    128,915/199,206 = 199,206/x
  3. Step 3: Cross multiply
    128,915x = 199,206 × 199,206
  4. Step 4: Simplify right side
    128,915x = 39,683,030,436
  5. Step 5: Solve for x
    x = 39,683,030,436/128,915
  6. Step 6: Final answer
    x = 307,823.22

Related Problems

Find third proportional to 64,457.50 and 99,603
Half scale
Find third proportional to 257,830 and 398,412
Double scale
Find third proportional to 128,917 and 199,209
Similar ratio
Find third proportional to 193,372.50 and 298,809
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.