Home / 85.44-128.25-63.71

Finding the Fourth Proportional to 85.44, 128.25 and 63.71

Calculator

Solution

The fourth proportional to 85.44, 128.25 and 63.71 is: 95.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.44 : 128.25 = 63.71 : x
  2. Step 2: Convert to fraction form
    85.44/128.25 = 63.71/x
  3. Step 3: Cross multiply
    85.44x = 128.25 × 63.71
  4. Step 4: Simplify right side
    85.44x = 8,170.81
  5. Step 5: Solve for x
    x = 8,170.81/85.44
  6. Step 6: Final answer
    x = 95.63

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.