Home / 133.20-199.50-81.68

Finding the Fourth Proportional to 133.20, 199.50 and 81.68

Calculator

Solution

The fourth proportional to 133.20, 199.50 and 81.68 is: 122.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.20 : 199.50 = 81.68 : x
  2. Step 2: Convert to fraction form
    133.20/199.50 = 81.68/x
  3. Step 3: Cross multiply
    133.20x = 199.50 × 81.68
  4. Step 4: Simplify right side
    133.20x = 16,294.16
  5. Step 5: Solve for x
    x = 16,294.16/133.20
  6. Step 6: Final answer
    x = 122.33

Related Problems

Find fourth proportional to 66.60, 99.75 and 40.84
Half scale
Find fourth proportional to 266.40, 399 and 163.35
Double scale
Find fourth proportional to 134.20, 201 and 82.68
Similar ratio
Find fourth proportional to 199.80, 299.25 and 122.51
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.