Home / 880.80-1,320-393.12

Finding the Fourth Proportional to 880.80, 1,320 and 393.12

Calculator

Solution

The fourth proportional to 880.80, 1,320 and 393.12 is: 589.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.80 : 1,320 = 393.12 : x
  2. Step 2: Convert to fraction form
    880.80/1,320 = 393.12/x
  3. Step 3: Cross multiply
    880.80x = 1,320 × 393.12
  4. Step 4: Simplify right side
    880.80x = 518,918.40
  5. Step 5: Solve for x
    x = 518,918.40/880.80
  6. Step 6: Final answer
    x = 589.14

Related Problems

Find fourth proportional to 440.40, 660 and 196.56
Half scale
Find fourth proportional to 1,761.60, 2,640 and 786.24
Double scale
Find fourth proportional to 881.80, 1,321.50 and 394.12
Similar ratio
Find fourth proportional to 1,321.20, 1,980 and 589.68
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.