Home / 215.79-323.60-78.78

Finding the Fourth Proportional to 215.79, 323.60 and 78.78

Calculator

Solution

The fourth proportional to 215.79, 323.60 and 78.78 is: 118.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.79 : 323.60 = 78.78 : x
  2. Step 2: Convert to fraction form
    215.79/323.60 = 78.78/x
  3. Step 3: Cross multiply
    215.79x = 323.60 × 78.78
  4. Step 4: Simplify right side
    215.79x = 25,492.81
  5. Step 5: Solve for x
    x = 25,492.81/215.79
  6. Step 6: Final answer
    x = 118.14

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.