Home / 85.68-128.44-42.92

Finding the Fourth Proportional to 85.68, 128.44 and 42.92

Calculator

Solution

The fourth proportional to 85.68, 128.44 and 42.92 is: 64.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.68 : 128.44 = 42.92 : x
  2. Step 2: Convert to fraction form
    85.68/128.44 = 42.92/x
  3. Step 3: Cross multiply
    85.68x = 128.44 × 42.92
  4. Step 4: Simplify right side
    85.68x = 5,512.64
  5. Step 5: Solve for x
    x = 5,512.64/85.68
  6. Step 6: Final answer
    x = 64.34

Related Problems

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.