Home / 85.73-128.60-40.09

Finding the Fourth Proportional to 85.73, 128.60 and 40.09

Calculator

Solution

The fourth proportional to 85.73, 128.60 and 40.09 is: 60.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.73 : 128.60 = 40.09 : x
  2. Step 2: Convert to fraction form
    85.73/128.60 = 40.09/x
  3. Step 3: Cross multiply
    85.73x = 128.60 × 40.09
  4. Step 4: Simplify right side
    85.73x = 5,155.70
  5. Step 5: Solve for x
    x = 5,155.70/85.73
  6. Step 6: Final answer
    x = 60.14

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.