Home / 85.68-128.31-63.99

Finding the Fourth Proportional to 85.68, 128.31 and 63.99

Calculator

Solution

The fourth proportional to 85.68, 128.31 and 63.99 is: 95.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.68 : 128.31 = 63.99 : x
  2. Step 2: Convert to fraction form
    85.68/128.31 = 63.99/x
  3. Step 3: Cross multiply
    85.68x = 128.31 × 63.99
  4. Step 4: Simplify right side
    85.68x = 8,210.32
  5. Step 5: Solve for x
    x = 8,210.32/85.68
  6. Step 6: Final answer
    x = 95.83

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.