Home / 327.28-491.40-289.12

Finding the Fourth Proportional to 327.28, 491.40 and 289.12

Calculator

Solution

The fourth proportional to 327.28, 491.40 and 289.12 is: 434.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.28 : 491.40 = 289.12 : x
  2. Step 2: Convert to fraction form
    327.28/491.40 = 289.12/x
  3. Step 3: Cross multiply
    327.28x = 491.40 × 289.12
  4. Step 4: Simplify right side
    327.28x = 142,073.57
  5. Step 5: Solve for x
    x = 142,073.57/327.28
  6. Step 6: Final answer
    x = 434.10

Related Problems

Find fourth proportional to 163.64, 245.70 and 144.56
Half scale
Find fourth proportional to 654.56, 982.80 and 578.24
Double scale
Find fourth proportional to 328.28, 492.90 and 290.12
Similar ratio
Find fourth proportional to 490.92, 737.10 and 433.68
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.