Home / 604-620

Finding the Third Proportional to 604 and 620

Calculator

Solution

The third proportional to 604 and 620 is: 636.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    604 : 620 = 620 : x
  2. Step 2: Convert to fraction form
    604/620 = 620/x
  3. Step 3: Cross multiply
    604x = 620 × 620
  4. Step 4: Simplify right side
    604x = 384,400
  5. Step 5: Solve for x
    x = 384,400/604
  6. Step 6: Final answer
    x = 636.42

Related Problems

Find third proportional to 302 and 310
Half scale
Find third proportional to 1,208 and 1,240
Double scale
Find third proportional to 606 and 622
Similar ratio
Find third proportional to 906 and 930
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.