Home / 221.50-332.32-99.78

Finding the Fourth Proportional to 221.50, 332.32 and 99.78

Calculator

Solution

The fourth proportional to 221.50, 332.32 and 99.78 is: 149.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.50 : 332.32 = 99.78 : x
  2. Step 2: Convert to fraction form
    221.50/332.32 = 99.78/x
  3. Step 3: Cross multiply
    221.50x = 332.32 × 99.78
  4. Step 4: Simplify right side
    221.50x = 33,158.89
  5. Step 5: Solve for x
    x = 33,158.89/221.50
  6. Step 6: Final answer
    x = 149.70

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.