Home / 8,910-18,909

Finding the Third Proportional to 8,910 and 18,909

Calculator

Solution

The third proportional to 8,910 and 18,909 is: 40,129.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,910 : 18,909 = 18,909 : x
  2. Step 2: Convert to fraction form
    8,910/18,909 = 18,909/x
  3. Step 3: Cross multiply
    8,910x = 18,909 × 18,909
  4. Step 4: Simplify right side
    8,910x = 357,550,281
  5. Step 5: Solve for x
    x = 357,550,281/8,910
  6. Step 6: Final answer
    x = 40,129.10

Related Problems

Find third proportional to 4,455 and 9,454.50
Half scale
Find third proportional to 17,820 and 37,818
Double scale
Find third proportional to 8,912 and 18,913
Similar ratio
Find third proportional to 13,365 and 28,363.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.