Home / 13,878-20,817-5,670

Finding the Fourth Proportional to 13,878, 20,817 and 5,670

Calculator

Solution

The fourth proportional to 13,878, 20,817 and 5,670 is: 8,505

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,878 : 20,817 = 5,670 : x
  2. Step 2: Convert to fraction form
    13,878/20,817 = 5,670/x
  3. Step 3: Cross multiply
    13,878x = 20,817 × 5,670
  4. Step 4: Simplify right side
    13,878x = 118,032,390
  5. Step 5: Solve for x
    x = 118,032,390/13,878
  6. Step 6: Final answer
    x = 8,505

Related Problems

Find fourth proportional to 6,939, 10,408.50 and 2,835
Half scale
Find fourth proportional to 27,756, 41,634 and 11,340
Double scale
Find fourth proportional to 13,879, 20,818.50 and 5,671
Similar ratio
Find fourth proportional to 20,817, 31,225.50 and 8,505
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.