Home / 109.13-171.21

Finding the Third Proportional to 109.13 and 171.21

Calculator

Solution

The third proportional to 109.13 and 171.21 is: 268.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.13 : 171.21 = 171.21 : x
  2. Step 2: Convert to fraction form
    109.13/171.21 = 171.21/x
  3. Step 3: Cross multiply
    109.13x = 171.21 × 171.21
  4. Step 4: Simplify right side
    109.13x = 29,313.19
  5. Step 5: Solve for x
    x = 29,313.19/109.13
  6. Step 6: Final answer
    x = 268.62

Related Problems

Find third proportional to 54.56 and 85.61
Half scale
Find third proportional to 218.25 and 342.42
Double scale
Find third proportional to 111 and 174
Similar ratio
Find third proportional to 163.69 and 256.82
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.