Home / 86.31-129.48-25.45

Finding the Fourth Proportional to 86.31, 129.48 and 25.45

Calculator

Solution

The fourth proportional to 86.31, 129.48 and 25.45 is: 38.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.31 : 129.48 = 25.45 : x
  2. Step 2: Convert to fraction form
    86.31/129.48 = 25.45/x
  3. Step 3: Cross multiply
    86.31x = 129.48 × 25.45
  4. Step 4: Simplify right side
    86.31x = 3,295.04
  5. Step 5: Solve for x
    x = 3,295.04/86.31
  6. Step 6: Final answer
    x = 38.18

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.