Home / 62.80-94.20-39.90

Finding the Fourth Proportional to 62.80, 94.20 and 39.90

Calculator

Solution

The fourth proportional to 62.80, 94.20 and 39.90 is: 59.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.80 : 94.20 = 39.90 : x
  2. Step 2: Convert to fraction form
    62.80/94.20 = 39.90/x
  3. Step 3: Cross multiply
    62.80x = 94.20 × 39.90
  4. Step 4: Simplify right side
    62.80x = 3,758.58
  5. Step 5: Solve for x
    x = 3,758.58/62.80
  6. Step 6: Final answer
    x = 59.85

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.