Home / 69.78-104.60-27

Finding the Fourth Proportional to 69.78, 104.60 and 27

Calculator

Solution

The fourth proportional to 69.78, 104.60 and 27 is: 40.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.78 : 104.60 = 27 : x
  2. Step 2: Convert to fraction form
    69.78/104.60 = 27/x
  3. Step 3: Cross multiply
    69.78x = 104.60 × 27
  4. Step 4: Simplify right side
    69.78x = 2,824.20
  5. Step 5: Solve for x
    x = 2,824.20/69.78
  6. Step 6: Final answer
    x = 40.47

Related Problems

Find fourth proportional to 34.89, 52.30 and 13.50
Half scale
Find fourth proportional to 139.56, 209.20 and 54
Double scale
Find fourth proportional to 70.78, 106.10 and 28
Similar ratio
Find fourth proportional to 104.67, 156.90 and 40.50
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.