Home / 1,121.79-1,682.82-391.11

Finding the Fourth Proportional to 1,121.79, 1,682.82 and 391.11

Calculator

Solution

The fourth proportional to 1,121.79, 1,682.82 and 391.11 is: 586.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.79 : 1,682.82 = 391.11 : x
  2. Step 2: Convert to fraction form
    1,121.79/1,682.82 = 391.11/x
  3. Step 3: Cross multiply
    1,121.79x = 1,682.82 × 391.11
  4. Step 4: Simplify right side
    1,121.79x = 658,167.73
  5. Step 5: Solve for x
    x = 658,167.73/1,121.79
  6. Step 6: Final answer
    x = 586.71

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.