Home / 115-189.75

Finding the Third Proportional to 115 and 189.75

Calculator

Solution

The third proportional to 115 and 189.75 is: 313.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    115 : 189.75 = 189.75 : x
  2. Step 2: Convert to fraction form
    115/189.75 = 189.75/x
  3. Step 3: Cross multiply
    115x = 189.75 × 189.75
  4. Step 4: Simplify right side
    115x = 36,005.06
  5. Step 5: Solve for x
    x = 36,005.06/115
  6. Step 6: Final answer
    x = 313.09

Related Problems

Find third proportional to 57.50 and 94.88
Half scale
Find third proportional to 230 and 379.50
Double scale
Find third proportional to 117 and 193
Similar ratio
Find third proportional to 172.50 and 284.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.