Home / 217.40-326.14-71.15

Finding the Fourth Proportional to 217.40, 326.14 and 71.15

Calculator

Solution

The fourth proportional to 217.40, 326.14 and 71.15 is: 106.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.40 : 326.14 = 71.15 : x
  2. Step 2: Convert to fraction form
    217.40/326.14 = 71.15/x
  3. Step 3: Cross multiply
    217.40x = 326.14 × 71.15
  4. Step 4: Simplify right side
    217.40x = 23,204.86
  5. Step 5: Solve for x
    x = 23,204.86/217.40
  6. Step 6: Final answer
    x = 106.74

Related Problems

Find fourth proportional to 108.70, 163.07 and 35.58
Half scale
Find fourth proportional to 434.80, 652.28 and 142.30
Double scale
Find fourth proportional to 218.40, 327.64 and 72.15
Similar ratio
Find fourth proportional to 326.10, 489.21 and 106.73
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.