Home / 85.82-128.70-34.40

Finding the Fourth Proportional to 85.82, 128.70 and 34.40

Calculator

Solution

The fourth proportional to 85.82, 128.70 and 34.40 is: 51.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.82 : 128.70 = 34.40 : x
  2. Step 2: Convert to fraction form
    85.82/128.70 = 34.40/x
  3. Step 3: Cross multiply
    85.82x = 128.70 × 34.40
  4. Step 4: Simplify right side
    85.82x = 4,427.28
  5. Step 5: Solve for x
    x = 4,427.28/85.82
  6. Step 6: Final answer
    x = 51.59

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.