Home / 20-51.75

Finding the Third Proportional to 20 and 51.75

Calculator

Solution

The third proportional to 20 and 51.75 is: 133.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20 : 51.75 = 51.75 : x
  2. Step 2: Convert to fraction form
    20/51.75 = 51.75/x
  3. Step 3: Cross multiply
    20x = 51.75 × 51.75
  4. Step 4: Simplify right side
    20x = 2,678.06
  5. Step 5: Solve for x
    x = 2,678.06/20
  6. Step 6: Final answer
    x = 133.90

Related Problems

Find third proportional to 10 and 25.88
Half scale
Find third proportional to 40 and 103.50
Double scale
Find third proportional to 22 and 57
Similar ratio
Find third proportional to 30 and 77.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.