Home / 121.53-167.64-72.39

Finding the Fourth Proportional to 121.53, 167.64 and 72.39

Calculator

Solution

The fourth proportional to 121.53, 167.64 and 72.39 is: 99.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.53 : 167.64 = 72.39 : x
  2. Step 2: Convert to fraction form
    121.53/167.64 = 72.39/x
  3. Step 3: Cross multiply
    121.53x = 167.64 × 72.39
  4. Step 4: Simplify right side
    121.53x = 12,135.10
  5. Step 5: Solve for x
    x = 12,135.10/121.53
  6. Step 6: Final answer
    x = 99.85

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.