Home / 3,929-6,420

Finding the Third Proportional to 3,929 and 6,420

Calculator

Solution

The third proportional to 3,929 and 6,420 is: 10,490.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929 : 6,420 = 6,420 : x
  2. Step 2: Convert to fraction form
    3,929/6,420 = 6,420/x
  3. Step 3: Cross multiply
    3,929x = 6,420 × 6,420
  4. Step 4: Simplify right side
    3,929x = 41,216,400
  5. Step 5: Solve for x
    x = 41,216,400/3,929
  6. Step 6: Final answer
    x = 10,490.30

Related Problems

Find third proportional to 1,964.50 and 3,210
Half scale
Find third proportional to 7,858 and 12,840
Double scale
Find third proportional to 3,931 and 6,423
Similar ratio
Find third proportional to 5,893.50 and 9,630
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.