Home / 418.13-638.11

Finding the Third Proportional to 418.13 and 638.11

Calculator

Solution

The third proportional to 418.13 and 638.11 is: 973.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.13 : 638.11 = 638.11 : x
  2. Step 2: Convert to fraction form
    418.13/638.11 = 638.11/x
  3. Step 3: Cross multiply
    418.13x = 638.11 × 638.11
  4. Step 4: Simplify right side
    418.13x = 407,187.31
  5. Step 5: Solve for x
    x = 407,187.31/418.13
  6. Step 6: Final answer
    x = 973.83

Related Problems

Find third proportional to 209.07 and 319.06
Half scale
Find third proportional to 836.26 and 1,276.22
Double scale
Find third proportional to 420 and 641
Similar ratio
Find third proportional to 627.20 and 957.17
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.