Home / 19.40-28.58

Finding the Third Proportional to 19.40 and 28.58

Calculator

Solution

The third proportional to 19.40 and 28.58 is: 42.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.40 : 28.58 = 28.58 : x
  2. Step 2: Convert to fraction form
    19.40/28.58 = 28.58/x
  3. Step 3: Cross multiply
    19.40x = 28.58 × 28.58
  4. Step 4: Simplify right side
    19.40x = 816.56
  5. Step 5: Solve for x
    x = 816.56/19.40
  6. Step 6: Final answer
    x = 42.09

Related Problems

Find third proportional to 9.70 and 14.29
Half scale
Find third proportional to 38.80 and 57.15
Double scale
Find third proportional to 21 and 32
Similar ratio
Find third proportional to 29.10 and 42.86
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.