Home / 79.64-118.80-78.20

Finding the Fourth Proportional to 79.64, 118.80 and 78.20

Calculator

Solution

The fourth proportional to 79.64, 118.80 and 78.20 is: 116.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.64 : 118.80 = 78.20 : x
  2. Step 2: Convert to fraction form
    79.64/118.80 = 78.20/x
  3. Step 3: Cross multiply
    79.64x = 118.80 × 78.20
  4. Step 4: Simplify right side
    79.64x = 9,289.77
  5. Step 5: Solve for x
    x = 9,289.77/79.64
  6. Step 6: Final answer
    x = 116.65

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.