Home / 174.45-240.77-100.78

Finding the Fourth Proportional to 174.45, 240.77 and 100.78

Calculator

Solution

The fourth proportional to 174.45, 240.77 and 100.78 is: 139.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.45 : 240.77 = 100.78 : x
  2. Step 2: Convert to fraction form
    174.45/240.77 = 100.78/x
  3. Step 3: Cross multiply
    174.45x = 240.77 × 100.78
  4. Step 4: Simplify right side
    174.45x = 24,264.80
  5. Step 5: Solve for x
    x = 24,264.80/174.45
  6. Step 6: Final answer
    x = 139.09

Related Problems

Find fourth proportional to 87.23, 120.39 and 50.39
Half scale
Find fourth proportional to 348.90, 481.54 and 201.56
Double scale
Find fourth proportional to 175.45, 242.15 and 101.78
Similar ratio
Find fourth proportional to 261.68, 361.16 and 151.17
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.