Home / 928-1,392-320

Finding the Fourth Proportional to 928, 1,392 and 320

Calculator

Solution

The fourth proportional to 928, 1,392 and 320 is: 480

Step by Step Solution

  1. Step 1: Write the proportion equation
    928 : 1,392 = 320 : x
  2. Step 2: Convert to fraction form
    928/1,392 = 320/x
  3. Step 3: Cross multiply
    928x = 1,392 × 320
  4. Step 4: Simplify right side
    928x = 445,440
  5. Step 5: Solve for x
    x = 445,440/928
  6. Step 6: Final answer
    x = 480

Related Problems

Find fourth proportional to 464, 696 and 160
Half scale
Find fourth proportional to 1,856, 2,784 and 640
Double scale
Find fourth proportional to 929, 1,393.50 and 321
Similar ratio
Find fourth proportional to 1,392, 2,088 and 480
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.