Home / 76.80-105.96-63.88

Finding the Fourth Proportional to 76.80, 105.96 and 63.88

Calculator

Solution

The fourth proportional to 76.80, 105.96 and 63.88 is: 88.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.80 : 105.96 = 63.88 : x
  2. Step 2: Convert to fraction form
    76.80/105.96 = 63.88/x
  3. Step 3: Cross multiply
    76.80x = 105.96 × 63.88
  4. Step 4: Simplify right side
    76.80x = 6,768.72
  5. Step 5: Solve for x
    x = 6,768.72/76.80
  6. Step 6: Final answer
    x = 88.13

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.