Home / 85-143

Finding the Third Proportional to 85 and 143

Calculator

Solution

The third proportional to 85 and 143 is: 240.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    85 : 143 = 143 : x
  2. Step 2: Convert to fraction form
    85/143 = 143/x
  3. Step 3: Cross multiply
    85x = 143 × 143
  4. Step 4: Simplify right side
    85x = 20,449
  5. Step 5: Solve for x
    x = 20,449/85
  6. Step 6: Final answer
    x = 240.58

Related Problems

Find third proportional to 42.50 and 71.50
Half scale
Find third proportional to 170 and 286
Double scale
Find third proportional to 87 and 146
Similar ratio
Find third proportional to 127.50 and 214.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.68) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.