Home / 82.10-122.55-72.38

Finding the Fourth Proportional to 82.10, 122.55 and 72.38

Calculator

Solution

The fourth proportional to 82.10, 122.55 and 72.38 is: 108.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.10 : 122.55 = 72.38 : x
  2. Step 2: Convert to fraction form
    82.10/122.55 = 72.38/x
  3. Step 3: Cross multiply
    82.10x = 122.55 × 72.38
  4. Step 4: Simplify right side
    82.10x = 8,870.17
  5. Step 5: Solve for x
    x = 8,870.17/82.10
  6. Step 6: Final answer
    x = 108.04

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.