Home / 85.62-128.39-34.22

Finding the Fourth Proportional to 85.62, 128.39 and 34.22

Calculator

Solution

The fourth proportional to 85.62, 128.39 and 34.22 is: 51.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.62 : 128.39 = 34.22 : x
  2. Step 2: Convert to fraction form
    85.62/128.39 = 34.22/x
  3. Step 3: Cross multiply
    85.62x = 128.39 × 34.22
  4. Step 4: Simplify right side
    85.62x = 4,393.66
  5. Step 5: Solve for x
    x = 4,393.66/85.62
  6. Step 6: Final answer
    x = 51.31

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.