Home / 11,918-15,678

Finding the Third Proportional to 11,918 and 15,678

Calculator

Solution

The third proportional to 11,918 and 15,678 is: 20,624.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,918 : 15,678 = 15,678 : x
  2. Step 2: Convert to fraction form
    11,918/15,678 = 15,678/x
  3. Step 3: Cross multiply
    11,918x = 15,678 × 15,678
  4. Step 4: Simplify right side
    11,918x = 245,799,684
  5. Step 5: Solve for x
    x = 245,799,684/11,918
  6. Step 6: Final answer
    x = 20,624.24

Related Problems

Find third proportional to 5,959 and 7,839
Half scale
Find third proportional to 23,836 and 31,356
Double scale
Find third proportional to 11,920 and 15,681
Similar ratio
Find third proportional to 17,877 and 23,517
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.