Home / 8,318-12,891

Finding the Third Proportional to 8,318 and 12,891

Calculator

Solution

The third proportional to 8,318 and 12,891 is: 19,978.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,318 : 12,891 = 12,891 : x
  2. Step 2: Convert to fraction form
    8,318/12,891 = 12,891/x
  3. Step 3: Cross multiply
    8,318x = 12,891 × 12,891
  4. Step 4: Simplify right side
    8,318x = 166,177,881
  5. Step 5: Solve for x
    x = 166,177,881/8,318
  6. Step 6: Final answer
    x = 19,978.11

Related Problems

Find third proportional to 4,159 and 6,445.50
Half scale
Find third proportional to 16,636 and 25,782
Double scale
Find third proportional to 8,320 and 12,894
Similar ratio
Find third proportional to 12,477 and 19,336.50
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.