Home / 14.91-21.09

Finding the Third Proportional to 14.91 and 21.09

Calculator

Solution

The third proportional to 14.91 and 21.09 is: 29.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.91 : 21.09 = 21.09 : x
  2. Step 2: Convert to fraction form
    14.91/21.09 = 21.09/x
  3. Step 3: Cross multiply
    14.91x = 21.09 × 21.09
  4. Step 4: Simplify right side
    14.91x = 444.95
  5. Step 5: Solve for x
    x = 444.95/14.91
  6. Step 6: Final answer
    x = 29.85

Related Problems

Find third proportional to 7.45 and 10.55
Half scale
Find third proportional to 29.81 and 42.19
Double scale
Find third proportional to 17 and 24
Similar ratio
Find third proportional to 22.36 and 31.64
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.