Home / 20,170-30,255-5,578

Finding the Fourth Proportional to 20,170, 30,255 and 5,578

Calculator

Solution

The fourth proportional to 20,170, 30,255 and 5,578 is: 8,367

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,170 : 30,255 = 5,578 : x
  2. Step 2: Convert to fraction form
    20,170/30,255 = 5,578/x
  3. Step 3: Cross multiply
    20,170x = 30,255 × 5,578
  4. Step 4: Simplify right side
    20,170x = 168,762,390
  5. Step 5: Solve for x
    x = 168,762,390/20,170
  6. Step 6: Final answer
    x = 8,367

Related Problems

Find fourth proportional to 10,085, 15,127.50 and 2,789
Half scale
Find fourth proportional to 40,340, 60,510 and 11,156
Double scale
Find fourth proportional to 20,171, 30,256.50 and 5,579
Similar ratio
Find fourth proportional to 30,255, 45,382.50 and 8,367
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.