Home / 68-101.98-19.89

Finding the Fourth Proportional to 68, 101.98 and 19.89

Calculator

Solution

The fourth proportional to 68, 101.98 and 19.89 is: 29.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    68 : 101.98 = 19.89 : x
  2. Step 2: Convert to fraction form
    68/101.98 = 19.89/x
  3. Step 3: Cross multiply
    68x = 101.98 × 19.89
  4. Step 4: Simplify right side
    68x = 2,028.38
  5. Step 5: Solve for x
    x = 2,028.38/68
  6. Step 6: Final answer
    x = 29.83

Related Problems

Find fourth proportional to 34, 50.99 and 9.95
Half scale
Find fourth proportional to 136, 203.96 and 39.78
Double scale
Find fourth proportional to 69, 103.48 and 20.89
Similar ratio
Find fourth proportional to 102, 152.97 and 29.84
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.