Home / 86.20-129.35-47.66

Finding the Fourth Proportional to 86.20, 129.35 and 47.66

Calculator

Solution

The fourth proportional to 86.20, 129.35 and 47.66 is: 71.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.20 : 129.35 = 47.66 : x
  2. Step 2: Convert to fraction form
    86.20/129.35 = 47.66/x
  3. Step 3: Cross multiply
    86.20x = 129.35 × 47.66
  4. Step 4: Simplify right side
    86.20x = 6,165.08
  5. Step 5: Solve for x
    x = 6,165.08/86.20
  6. Step 6: Final answer
    x = 71.52

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.