Home / 64.25-138.75

Finding the Third Proportional to 64.25 and 138.75

Calculator

Solution

The third proportional to 64.25 and 138.75 is: 299.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.25 : 138.75 = 138.75 : x
  2. Step 2: Convert to fraction form
    64.25/138.75 = 138.75/x
  3. Step 3: Cross multiply
    64.25x = 138.75 × 138.75
  4. Step 4: Simplify right side
    64.25x = 19,251.56
  5. Step 5: Solve for x
    x = 19,251.56/64.25
  6. Step 6: Final answer
    x = 299.64

Related Problems

Find third proportional to 32.13 and 69.38
Half scale
Find third proportional to 128.50 and 277.50
Double scale
Find third proportional to 66 and 143
Similar ratio
Find third proportional to 96.38 and 208.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.