Home / 162.78-243.81-111.21

Finding the Fourth Proportional to 162.78, 243.81 and 111.21

Calculator

Solution

The fourth proportional to 162.78, 243.81 and 111.21 is: 166.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.78 : 243.81 = 111.21 : x
  2. Step 2: Convert to fraction form
    162.78/243.81 = 111.21/x
  3. Step 3: Cross multiply
    162.78x = 243.81 × 111.21
  4. Step 4: Simplify right side
    162.78x = 27,114.11
  5. Step 5: Solve for x
    x = 27,114.11/162.78
  6. Step 6: Final answer
    x = 166.57

Related Problems

Find fourth proportional to 81.39, 121.91 and 55.61
Half scale
Find fourth proportional to 325.56, 487.62 and 222.42
Double scale
Find fourth proportional to 163.78, 245.31 and 112.21
Similar ratio
Find fourth proportional to 244.17, 365.72 and 166.82
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.