Home / 21,142-31,713-8,830

Finding the Fourth Proportional to 21,142, 31,713 and 8,830

Calculator

Solution

The fourth proportional to 21,142, 31,713 and 8,830 is: 13,245

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,142 : 31,713 = 8,830 : x
  2. Step 2: Convert to fraction form
    21,142/31,713 = 8,830/x
  3. Step 3: Cross multiply
    21,142x = 31,713 × 8,830
  4. Step 4: Simplify right side
    21,142x = 280,025,790
  5. Step 5: Solve for x
    x = 280,025,790/21,142
  6. Step 6: Final answer
    x = 13,245

Related Problems

Find fourth proportional to 10,571, 15,856.50 and 4,415
Half scale
Find fourth proportional to 42,284, 63,426 and 17,660
Double scale
Find fourth proportional to 21,143, 31,714.50 and 8,831
Similar ratio
Find fourth proportional to 31,713, 47,569.50 and 13,245
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.