Home / 113-156-87.08

Finding the Fourth Proportional to 113, 156 and 87.08

Calculator

Solution

The fourth proportional to 113, 156 and 87.08 is: 120.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    113 : 156 = 87.08 : x
  2. Step 2: Convert to fraction form
    113/156 = 87.08/x
  3. Step 3: Cross multiply
    113x = 156 × 87.08
  4. Step 4: Simplify right side
    113x = 13,584.48
  5. Step 5: Solve for x
    x = 13,584.48/113
  6. Step 6: Final answer
    x = 120.22

Related Problems

Find fourth proportional to 56.50, 78 and 43.54
Half scale
Find fourth proportional to 226, 312 and 174.16
Double scale
Find fourth proportional to 114, 157.38 and 88.08
Similar ratio
Find fourth proportional to 169.50, 234 and 130.62
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.