Home / 424-644

Finding the Third Proportional to 424 and 644

Calculator

Solution

The third proportional to 424 and 644 is: 978.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    424 : 644 = 644 : x
  2. Step 2: Convert to fraction form
    424/644 = 644/x
  3. Step 3: Cross multiply
    424x = 644 × 644
  4. Step 4: Simplify right side
    424x = 414,736
  5. Step 5: Solve for x
    x = 414,736/424
  6. Step 6: Final answer
    x = 978.15

Related Problems

Find third proportional to 212 and 322
Half scale
Find third proportional to 848 and 1,288
Double scale
Find third proportional to 426 and 647
Similar ratio
Find third proportional to 636 and 966
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.