Home / 25-34.50-15.31

Finding the Fourth Proportional to 25, 34.50 and 15.31

Calculator

Solution

The fourth proportional to 25, 34.50 and 15.31 is: 21.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    25 : 34.50 = 15.31 : x
  2. Step 2: Convert to fraction form
    25/34.50 = 15.31/x
  3. Step 3: Cross multiply
    25x = 34.50 × 15.31
  4. Step 4: Simplify right side
    25x = 528.02
  5. Step 5: Solve for x
    x = 528.02/25
  6. Step 6: Final answer
    x = 21.12

Related Problems

Find fourth proportional to 12.50, 17.25 and 7.65
Half scale
Find fourth proportional to 50, 69 and 30.61
Double scale
Find fourth proportional to 26, 35.88 and 16.31
Similar ratio
Find fourth proportional to 37.50, 51.75 and 22.96
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.