Home / 128,854-189,417

Finding the Third Proportional to 128,854 and 189,417

Calculator

Solution

The third proportional to 128,854 and 189,417 is: 278,445.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,854 : 189,417 = 189,417 : x
  2. Step 2: Convert to fraction form
    128,854/189,417 = 189,417/x
  3. Step 3: Cross multiply
    128,854x = 189,417 × 189,417
  4. Step 4: Simplify right side
    128,854x = 35,878,799,889
  5. Step 5: Solve for x
    x = 35,878,799,889/128,854
  6. Step 6: Final answer
    x = 278,445.37

Related Problems

Find third proportional to 64,427 and 94,708.50
Half scale
Find third proportional to 257,708 and 378,834
Double scale
Find third proportional to 128,856 and 189,420
Similar ratio
Find third proportional to 193,281 and 284,125.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.