Home / 78.18-117.41-61.08

Finding the Fourth Proportional to 78.18, 117.41 and 61.08

Calculator

Solution

The fourth proportional to 78.18, 117.41 and 61.08 is: 91.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.18 : 117.41 = 61.08 : x
  2. Step 2: Convert to fraction form
    78.18/117.41 = 61.08/x
  3. Step 3: Cross multiply
    78.18x = 117.41 × 61.08
  4. Step 4: Simplify right side
    78.18x = 7,171.10
  5. Step 5: Solve for x
    x = 7,171.10/78.18
  6. Step 6: Final answer
    x = 91.73

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.