Home / 247.91-371.39-139.37

Finding the Fourth Proportional to 247.91, 371.39 and 139.37

Calculator

Solution

The fourth proportional to 247.91, 371.39 and 139.37 is: 208.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.91 : 371.39 = 139.37 : x
  2. Step 2: Convert to fraction form
    247.91/371.39 = 139.37/x
  3. Step 3: Cross multiply
    247.91x = 371.39 × 139.37
  4. Step 4: Simplify right side
    247.91x = 51,761.90
  5. Step 5: Solve for x
    x = 51,761.90/247.91
  6. Step 6: Final answer
    x = 208.79

Related Problems

Find fourth proportional to 123.96, 185.70 and 69.69
Half scale
Find fourth proportional to 495.83, 742.79 and 278.75
Double scale
Find fourth proportional to 248.91, 372.89 and 140.37
Similar ratio
Find fourth proportional to 371.87, 557.09 and 209.06
1.5x scale

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.