Home / 313.88-645.75

Finding the Third Proportional to 313.88 and 645.75

Calculator

Solution

The third proportional to 313.88 and 645.75 is: 1,328.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.88 : 645.75 = 645.75 : x
  2. Step 2: Convert to fraction form
    313.88/645.75 = 645.75/x
  3. Step 3: Cross multiply
    313.88x = 645.75 × 645.75
  4. Step 4: Simplify right side
    313.88x = 416,993.06
  5. Step 5: Solve for x
    x = 416,993.06/313.88
  6. Step 6: Final answer
    x = 1,328.53

Related Problems

Find third proportional to 156.94 and 322.88
Half scale
Find third proportional to 627.75 and 1,291.50
Double scale
Find third proportional to 316 and 650
Similar ratio
Find third proportional to 470.81 and 968.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.