Home / 10-21.19

Finding the Third Proportional to 10 and 21.19

Calculator

Solution

The third proportional to 10 and 21.19 is: 44.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    10 : 21.19 = 21.19 : x
  2. Step 2: Convert to fraction form
    10/21.19 = 21.19/x
  3. Step 3: Cross multiply
    10x = 21.19 × 21.19
  4. Step 4: Simplify right side
    10x = 448.91
  5. Step 5: Solve for x
    x = 448.91/10
  6. Step 6: Final answer
    x = 44.89

Related Problems

Find third proportional to 5 and 10.59
Half scale
Find third proportional to 20 and 42.38
Double scale
Find third proportional to 12 and 25
Similar ratio
Find third proportional to 15 and 31.78
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.