Home / 67-100.50-21.39

Finding the Fourth Proportional to 67, 100.50 and 21.39

Calculator

Solution

The fourth proportional to 67, 100.50 and 21.39 is: 32.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    67 : 100.50 = 21.39 : x
  2. Step 2: Convert to fraction form
    67/100.50 = 21.39/x
  3. Step 3: Cross multiply
    67x = 100.50 × 21.39
  4. Step 4: Simplify right side
    67x = 2,149.44
  5. Step 5: Solve for x
    x = 2,149.44/67
  6. Step 6: Final answer
    x = 32.08

Related Problems

Find fourth proportional to 33.50, 50.25 and 10.69
Half scale
Find fourth proportional to 134, 201 and 42.78
Double scale
Find fourth proportional to 68, 102 and 22.39
Similar ratio
Find fourth proportional to 100.50, 150.75 and 32.08
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.