Home / 235.11-324.45-128.77

Finding the Fourth Proportional to 235.11, 324.45 and 128.77

Calculator

Solution

The fourth proportional to 235.11, 324.45 and 128.77 is: 177.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.11 : 324.45 = 128.77 : x
  2. Step 2: Convert to fraction form
    235.11/324.45 = 128.77/x
  3. Step 3: Cross multiply
    235.11x = 324.45 × 128.77
  4. Step 4: Simplify right side
    235.11x = 41,779.67
  5. Step 5: Solve for x
    x = 41,779.67/235.11
  6. Step 6: Final answer
    x = 177.70

Related Problems

Find fourth proportional to 117.56, 162.23 and 64.39
Half scale
Find fourth proportional to 470.23, 648.90 and 257.54
Double scale
Find fourth proportional to 236.11, 325.83 and 129.77
Similar ratio
Find fourth proportional to 352.67, 486.68 and 193.16
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.