Home / 134.18-185.21-87.55

Finding the Fourth Proportional to 134.18, 185.21 and 87.55

Calculator

Solution

The fourth proportional to 134.18, 185.21 and 87.55 is: 120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.18 : 185.21 = 87.55 : x
  2. Step 2: Convert to fraction form
    134.18/185.21 = 87.55/x
  3. Step 3: Cross multiply
    134.18x = 185.21 × 87.55
  4. Step 4: Simplify right side
    134.18x = 16,215.14
  5. Step 5: Solve for x
    x = 16,215.14/134.18
  6. Step 6: Final answer
    x = 120.85

Related Problems

Find fourth proportional to 67.09, 92.61 and 43.78
Half scale
Find fourth proportional to 268.36, 370.42 and 175.10
Double scale
Find fourth proportional to 135.18, 186.59 and 88.55
Similar ratio
Find fourth proportional to 201.27, 277.82 and 131.33
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.