Home / 132.80-183.20-76.78

Finding the Fourth Proportional to 132.80, 183.20 and 76.78

Calculator

Solution

The fourth proportional to 132.80, 183.20 and 76.78 is: 105.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.80 : 183.20 = 76.78 : x
  2. Step 2: Convert to fraction form
    132.80/183.20 = 76.78/x
  3. Step 3: Cross multiply
    132.80x = 183.20 × 76.78
  4. Step 4: Simplify right side
    132.80x = 14,066.10
  5. Step 5: Solve for x
    x = 14,066.10/132.80
  6. Step 6: Final answer
    x = 105.92

Related Problems

Find fourth proportional to 66.40, 91.60 and 38.39
Half scale
Find fourth proportional to 265.60, 366.40 and 153.56
Double scale
Find fourth proportional to 133.80, 184.58 and 77.78
Similar ratio
Find fourth proportional to 199.20, 274.80 and 115.17
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.