Home / 416.91-625.38-128.28

Finding the Fourth Proportional to 416.91, 625.38 and 128.28

Calculator

Solution

The fourth proportional to 416.91, 625.38 and 128.28 is: 192.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.91 : 625.38 = 128.28 : x
  2. Step 2: Convert to fraction form
    416.91/625.38 = 128.28/x
  3. Step 3: Cross multiply
    416.91x = 625.38 × 128.28
  4. Step 4: Simplify right side
    416.91x = 80,223.75
  5. Step 5: Solve for x
    x = 80,223.75/416.91
  6. Step 6: Final answer
    x = 192.42

Related Problems

Find fourth proportional to 208.46, 312.69 and 64.14
Half scale
Find fourth proportional to 833.82, 1,250.76 and 256.56
Double scale
Find fourth proportional to 417.91, 626.88 and 129.28
Similar ratio
Find fourth proportional to 625.37, 938.07 and 192.42
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.