Home / 138,428-212,211

Finding the Third Proportional to 138,428 and 212,211

Calculator

Solution

The third proportional to 138,428 and 212,211 is: 325,320.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,428 : 212,211 = 212,211 : x
  2. Step 2: Convert to fraction form
    138,428/212,211 = 212,211/x
  3. Step 3: Cross multiply
    138,428x = 212,211 × 212,211
  4. Step 4: Simplify right side
    138,428x = 45,033,508,521
  5. Step 5: Solve for x
    x = 45,033,508,521/138,428
  6. Step 6: Final answer
    x = 325,320.81

Related Problems

Find third proportional to 69,214 and 106,105.50
Half scale
Find third proportional to 276,856 and 424,422
Double scale
Find third proportional to 138,430 and 212,214
Similar ratio
Find third proportional to 207,642 and 318,316.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.