Home / 325.26-487.88-81.78

Finding the Fourth Proportional to 325.26, 487.88 and 81.78

Calculator

Solution

The fourth proportional to 325.26, 487.88 and 81.78 is: 122.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.26 : 487.88 = 81.78 : x
  2. Step 2: Convert to fraction form
    325.26/487.88 = 81.78/x
  3. Step 3: Cross multiply
    325.26x = 487.88 × 81.78
  4. Step 4: Simplify right side
    325.26x = 39,898.83
  5. Step 5: Solve for x
    x = 39,898.83/325.26
  6. Step 6: Final answer
    x = 122.67

Related Problems

Find fourth proportional to 162.63, 243.94 and 40.89
Half scale
Find fourth proportional to 650.52, 975.76 and 163.56
Double scale
Find fourth proportional to 326.26, 489.38 and 82.78
Similar ratio
Find fourth proportional to 487.89, 731.82 and 122.67
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.