Home / 206.83-310.31-85.15

Finding the Fourth Proportional to 206.83, 310.31 and 85.15

Calculator

Solution

The fourth proportional to 206.83, 310.31 and 85.15 is: 127.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.83 : 310.31 = 85.15 : x
  2. Step 2: Convert to fraction form
    206.83/310.31 = 85.15/x
  3. Step 3: Cross multiply
    206.83x = 310.31 × 85.15
  4. Step 4: Simplify right side
    206.83x = 26,422.90
  5. Step 5: Solve for x
    x = 26,422.90/206.83
  6. Step 6: Final answer
    x = 127.75

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.