Home / 235.91-353.78-81.80

Finding the Fourth Proportional to 235.91, 353.78 and 81.80

Calculator

Solution

The fourth proportional to 235.91, 353.78 and 81.80 is: 122.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.91 : 353.78 = 81.80 : x
  2. Step 2: Convert to fraction form
    235.91/353.78 = 81.80/x
  3. Step 3: Cross multiply
    235.91x = 353.78 × 81.80
  4. Step 4: Simplify right side
    235.91x = 28,937.64
  5. Step 5: Solve for x
    x = 28,937.64/235.91
  6. Step 6: Final answer
    x = 122.66

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.