Home / 162.09-243.09-80.78

Finding the Fourth Proportional to 162.09, 243.09 and 80.78

Calculator

Solution

The fourth proportional to 162.09, 243.09 and 80.78 is: 121.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.09 : 243.09 = 80.78 : x
  2. Step 2: Convert to fraction form
    162.09/243.09 = 80.78/x
  3. Step 3: Cross multiply
    162.09x = 243.09 × 80.78
  4. Step 4: Simplify right side
    162.09x = 19,635.59
  5. Step 5: Solve for x
    x = 19,635.59/162.09
  6. Step 6: Final answer
    x = 121.14

Related Problems

Find fourth proportional to 81.05, 121.55 and 40.39
Half scale
Find fourth proportional to 324.18, 486.18 and 161.55
Double scale
Find fourth proportional to 163.09, 244.59 and 81.78
Similar ratio
Find fourth proportional to 243.14, 364.64 and 121.16
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.