Home / 8,916-12,988

Finding the Third Proportional to 8,916 and 12,988

Calculator

Solution

The third proportional to 8,916 and 12,988 is: 18,919.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,916 : 12,988 = 12,988 : x
  2. Step 2: Convert to fraction form
    8,916/12,988 = 12,988/x
  3. Step 3: Cross multiply
    8,916x = 12,988 × 12,988
  4. Step 4: Simplify right side
    8,916x = 168,688,144
  5. Step 5: Solve for x
    x = 168,688,144/8,916
  6. Step 6: Final answer
    x = 18,919.71

Related Problems

Find third proportional to 4,458 and 6,494
Half scale
Find third proportional to 17,832 and 25,976
Double scale
Find third proportional to 8,918 and 12,991
Similar ratio
Find third proportional to 13,374 and 19,482
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.