Home / 17.23-23.79-15.21

Finding the Fourth Proportional to 17.23, 23.79 and 15.21

Calculator

Solution

The fourth proportional to 17.23, 23.79 and 15.21 is: 21.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.23 : 23.79 = 15.21 : x
  2. Step 2: Convert to fraction form
    17.23/23.79 = 15.21/x
  3. Step 3: Cross multiply
    17.23x = 23.79 × 15.21
  4. Step 4: Simplify right side
    17.23x = 361.85
  5. Step 5: Solve for x
    x = 361.85/17.23
  6. Step 6: Final answer
    x = 21.00

Related Problems

Find fourth proportional to 8.62, 11.90 and 7.61
Half scale
Find fourth proportional to 34.46, 47.58 and 30.42
Double scale
Find fourth proportional to 18.23, 25.17 and 16.21
Similar ratio
Find fourth proportional to 25.85, 35.69 and 22.82
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.