Home / 168.78-252.68-128.36

Finding the Fourth Proportional to 168.78, 252.68 and 128.36

Calculator

Solution

The fourth proportional to 168.78, 252.68 and 128.36 is: 192.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.78 : 252.68 = 128.36 : x
  2. Step 2: Convert to fraction form
    168.78/252.68 = 128.36/x
  3. Step 3: Cross multiply
    168.78x = 252.68 × 128.36
  4. Step 4: Simplify right side
    168.78x = 32,434.00
  5. Step 5: Solve for x
    x = 32,434.00/168.78
  6. Step 6: Final answer
    x = 192.17

Related Problems

Find fourth proportional to 84.39, 126.34 and 64.18
Half scale
Find fourth proportional to 337.56, 505.36 and 256.72
Double scale
Find fourth proportional to 169.78, 254.18 and 129.36
Similar ratio
Find fourth proportional to 253.17, 379.02 and 192.54
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.