Home / 116.78-161.06-81.81

Finding the Fourth Proportional to 116.78, 161.06 and 81.81

Calculator

Solution

The fourth proportional to 116.78, 161.06 and 81.81 is: 112.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.78 : 161.06 = 81.81 : x
  2. Step 2: Convert to fraction form
    116.78/161.06 = 81.81/x
  3. Step 3: Cross multiply
    116.78x = 161.06 × 81.81
  4. Step 4: Simplify right side
    116.78x = 13,175.91
  5. Step 5: Solve for x
    x = 13,175.91/116.78
  6. Step 6: Final answer
    x = 112.83

Related Problems

Find fourth proportional to 58.39, 80.53 and 40.91
Half scale
Find fourth proportional to 233.55, 322.11 and 163.62
Double scale
Find fourth proportional to 117.78, 162.43 and 82.81
Similar ratio
Find fourth proportional to 175.16, 241.58 and 122.72
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.