Home / 78.72-117.78-55.95

Finding the Fourth Proportional to 78.72, 117.78 and 55.95

Calculator

Solution

The fourth proportional to 78.72, 117.78 and 55.95 is: 83.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.72 : 117.78 = 55.95 : x
  2. Step 2: Convert to fraction form
    78.72/117.78 = 55.95/x
  3. Step 3: Cross multiply
    78.72x = 117.78 × 55.95
  4. Step 4: Simplify right side
    78.72x = 6,589.79
  5. Step 5: Solve for x
    x = 6,589.79/78.72
  6. Step 6: Final answer
    x = 83.71

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.