Home / 121.52-167.68-72.40

Finding the Fourth Proportional to 121.52, 167.68 and 72.40

Calculator

Solution

The fourth proportional to 121.52, 167.68 and 72.40 is: 99.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.52 : 167.68 = 72.40 : x
  2. Step 2: Convert to fraction form
    121.52/167.68 = 72.40/x
  3. Step 3: Cross multiply
    121.52x = 167.68 × 72.40
  4. Step 4: Simplify right side
    121.52x = 12,140.03
  5. Step 5: Solve for x
    x = 12,140.03/121.52
  6. Step 6: Final answer
    x = 99.90

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.