Home / 5,120-7,680-1,472

Finding the Fourth Proportional to 5,120, 7,680 and 1,472

Calculator

Solution

The fourth proportional to 5,120, 7,680 and 1,472 is: 2,208

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120 : 7,680 = 1,472 : x
  2. Step 2: Convert to fraction form
    5,120/7,680 = 1,472/x
  3. Step 3: Cross multiply
    5,120x = 7,680 × 1,472
  4. Step 4: Simplify right side
    5,120x = 11,304,960
  5. Step 5: Solve for x
    x = 11,304,960/5,120
  6. Step 6: Final answer
    x = 2,208

Related Problems

Find fourth proportional to 2,560, 3,840 and 736
Half scale
Find fourth proportional to 10,240, 15,360 and 2,944
Double scale
Find fourth proportional to 5,121, 7,681.50 and 1,473
Similar ratio
Find fourth proportional to 7,680, 11,520 and 2,208
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.