Home / 15,129-21,161

Finding the Third Proportional to 15,129 and 21,161

Calculator

Solution

The third proportional to 15,129 and 21,161 is: 29,597.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,129 : 21,161 = 21,161 : x
  2. Step 2: Convert to fraction form
    15,129/21,161 = 21,161/x
  3. Step 3: Cross multiply
    15,129x = 21,161 × 21,161
  4. Step 4: Simplify right side
    15,129x = 447,787,921
  5. Step 5: Solve for x
    x = 447,787,921/15,129
  6. Step 6: Final answer
    x = 29,597.99

Related Problems

Find third proportional to 7,564.50 and 10,580.50
Half scale
Find third proportional to 30,258 and 42,322
Double scale
Find third proportional to 15,131 and 21,164
Similar ratio
Find third proportional to 22,693.50 and 31,741.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.