Home / 179.72-248.12-138.20

Finding the Fourth Proportional to 179.72, 248.12 and 138.20

Calculator

Solution

The fourth proportional to 179.72, 248.12 and 138.20 is: 190.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.72 : 248.12 = 138.20 : x
  2. Step 2: Convert to fraction form
    179.72/248.12 = 138.20/x
  3. Step 3: Cross multiply
    179.72x = 248.12 × 138.20
  4. Step 4: Simplify right side
    179.72x = 34,289.29
  5. Step 5: Solve for x
    x = 34,289.29/179.72
  6. Step 6: Final answer
    x = 190.79

Related Problems

Find fourth proportional to 89.86, 124.06 and 69.10
Half scale
Find fourth proportional to 359.45, 496.25 and 276.39
Double scale
Find fourth proportional to 180.72, 249.50 and 139.20
Similar ratio
Find fourth proportional to 269.58, 372.18 and 207.29
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.