Home / 115.80-159.83-72.12

Finding the Fourth Proportional to 115.80, 159.83 and 72.12

Calculator

Solution

The fourth proportional to 115.80, 159.83 and 72.12 is: 99.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.80 : 159.83 = 72.12 : x
  2. Step 2: Convert to fraction form
    115.80/159.83 = 72.12/x
  3. Step 3: Cross multiply
    115.80x = 159.83 × 72.12
  4. Step 4: Simplify right side
    115.80x = 11,526.94
  5. Step 5: Solve for x
    x = 11,526.94/115.80
  6. Step 6: Final answer
    x = 99.54

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.