Home / 21.31-31.96-12.76

Finding the Fourth Proportional to 21.31, 31.96 and 12.76

Calculator

Solution

The fourth proportional to 21.31, 31.96 and 12.76 is: 19.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.31 : 31.96 = 12.76 : x
  2. Step 2: Convert to fraction form
    21.31/31.96 = 12.76/x
  3. Step 3: Cross multiply
    21.31x = 31.96 × 12.76
  4. Step 4: Simplify right side
    21.31x = 407.75
  5. Step 5: Solve for x
    x = 407.75/21.31
  6. Step 6: Final answer
    x = 19.13

Related Problems

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.