Home / 189-309.75

Finding the Third Proportional to 189 and 309.75

Calculator

Solution

The third proportional to 189 and 309.75 is: 507.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    189 : 309.75 = 309.75 : x
  2. Step 2: Convert to fraction form
    189/309.75 = 309.75/x
  3. Step 3: Cross multiply
    189x = 309.75 × 309.75
  4. Step 4: Simplify right side
    189x = 95,945.06
  5. Step 5: Solve for x
    x = 95,945.06/189
  6. Step 6: Final answer
    x = 507.65

Related Problems

Find third proportional to 94.50 and 154.88
Half scale
Find third proportional to 378 and 619.50
Double scale
Find third proportional to 191 and 313
Similar ratio
Find third proportional to 283.50 and 464.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.