Home / 325.28-488-142.72

Finding the Fourth Proportional to 325.28, 488 and 142.72

Calculator

Solution

The fourth proportional to 325.28, 488 and 142.72 is: 214.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.28 : 488 = 142.72 : x
  2. Step 2: Convert to fraction form
    325.28/488 = 142.72/x
  3. Step 3: Cross multiply
    325.28x = 488 × 142.72
  4. Step 4: Simplify right side
    325.28x = 69,647.36
  5. Step 5: Solve for x
    x = 69,647.36/325.28
  6. Step 6: Final answer
    x = 214.12

Related Problems

Find fourth proportional to 162.64, 244 and 71.36
Half scale
Find fourth proportional to 650.56, 976 and 285.44
Double scale
Find fourth proportional to 326.28, 489.50 and 143.72
Similar ratio
Find fourth proportional to 487.92, 732 and 214.08
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.