Home / 636-1,689.75

Finding the Third Proportional to 636 and 1,689.75

Calculator

Solution

The third proportional to 636 and 1,689.75 is: 4,489.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    636 : 1,689.75 = 1,689.75 : x
  2. Step 2: Convert to fraction form
    636/1,689.75 = 1,689.75/x
  3. Step 3: Cross multiply
    636x = 1,689.75 × 1,689.75
  4. Step 4: Simplify right side
    636x = 2,855,255.06
  5. Step 5: Solve for x
    x = 2,855,255.06/636
  6. Step 6: Final answer
    x = 4,489.39

Related Problems

Find third proportional to 318 and 844.88
Half scale
Find third proportional to 1,272 and 3,379.50
Double scale
Find third proportional to 638 and 1,695
Similar ratio
Find third proportional to 954 and 2,534.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.