Home / 147.36-221.14-138.39

Finding the Fourth Proportional to 147.36, 221.14 and 138.39

Calculator

Solution

The fourth proportional to 147.36, 221.14 and 138.39 is: 207.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.36 : 221.14 = 138.39 : x
  2. Step 2: Convert to fraction form
    147.36/221.14 = 138.39/x
  3. Step 3: Cross multiply
    147.36x = 221.14 × 138.39
  4. Step 4: Simplify right side
    147.36x = 30,603.56
  5. Step 5: Solve for x
    x = 30,603.56/147.36
  6. Step 6: Final answer
    x = 207.69

Related Problems

Find fourth proportional to 73.68, 110.57 and 69.20
Half scale
Find fourth proportional to 294.71, 442.28 and 276.78
Double scale
Find fourth proportional to 148.36, 222.64 and 139.39
Similar ratio
Find fourth proportional to 221.03, 331.71 and 207.59
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.