Home / 69.75-171.75

Finding the Third Proportional to 69.75 and 171.75

Calculator

Solution

The third proportional to 69.75 and 171.75 is: 422.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.75 : 171.75 = 171.75 : x
  2. Step 2: Convert to fraction form
    69.75/171.75 = 171.75/x
  3. Step 3: Cross multiply
    69.75x = 171.75 × 171.75
  4. Step 4: Simplify right side
    69.75x = 29,498.06
  5. Step 5: Solve for x
    x = 29,498.06/69.75
  6. Step 6: Final answer
    x = 422.91

Related Problems

Find third proportional to 34.88 and 85.88
Half scale
Find third proportional to 139.50 and 343.50
Double scale
Find third proportional to 72 and 177
Similar ratio
Find third proportional to 104.63 and 257.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.