Home / 192.80-289.32-120.72

Finding the Fourth Proportional to 192.80, 289.32 and 120.72

Calculator

Solution

The fourth proportional to 192.80, 289.32 and 120.72 is: 181.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.80 : 289.32 = 120.72 : x
  2. Step 2: Convert to fraction form
    192.80/289.32 = 120.72/x
  3. Step 3: Cross multiply
    192.80x = 289.32 × 120.72
  4. Step 4: Simplify right side
    192.80x = 34,926.71
  5. Step 5: Solve for x
    x = 34,926.71/192.80
  6. Step 6: Final answer
    x = 181.16

Related Problems

Find fourth proportional to 96.40, 144.66 and 60.36
Half scale
Find fourth proportional to 385.60, 578.64 and 241.44
Double scale
Find fourth proportional to 193.80, 290.82 and 121.72
Similar ratio
Find fourth proportional to 289.20, 433.98 and 181.08
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.