Home / 21,228-31,842-6,636

Finding the Fourth Proportional to 21,228, 31,842 and 6,636

Calculator

Solution

The fourth proportional to 21,228, 31,842 and 6,636 is: 9,954

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,228 : 31,842 = 6,636 : x
  2. Step 2: Convert to fraction form
    21,228/31,842 = 6,636/x
  3. Step 3: Cross multiply
    21,228x = 31,842 × 6,636
  4. Step 4: Simplify right side
    21,228x = 211,303,512
  5. Step 5: Solve for x
    x = 211,303,512/21,228
  6. Step 6: Final answer
    x = 9,954

Related Problems

Find fourth proportional to 10,614, 15,921 and 3,318
Half scale
Find fourth proportional to 42,456, 63,684 and 13,272
Double scale
Find fourth proportional to 21,229, 31,843.50 and 6,637
Similar ratio
Find fourth proportional to 31,842, 47,763 and 9,954
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.