Home / 85.20-127.80-73.32

Finding the Fourth Proportional to 85.20, 127.80 and 73.32

Calculator

Solution

The fourth proportional to 85.20, 127.80 and 73.32 is: 109.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.20 : 127.80 = 73.32 : x
  2. Step 2: Convert to fraction form
    85.20/127.80 = 73.32/x
  3. Step 3: Cross multiply
    85.20x = 127.80 × 73.32
  4. Step 4: Simplify right side
    85.20x = 9,370.30
  5. Step 5: Solve for x
    x = 9,370.30/85.20
  6. Step 6: Final answer
    x = 109.98

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.