Home / 278.11-417.14-85.73

Finding the Fourth Proportional to 278.11, 417.14 and 85.73

Calculator

Solution

The fourth proportional to 278.11, 417.14 and 85.73 is: 128.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.11 : 417.14 = 85.73 : x
  2. Step 2: Convert to fraction form
    278.11/417.14 = 85.73/x
  3. Step 3: Cross multiply
    278.11x = 417.14 × 85.73
  4. Step 4: Simplify right side
    278.11x = 35,760.98
  5. Step 5: Solve for x
    x = 35,760.98/278.11
  6. Step 6: Final answer
    x = 128.59

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.