Home / 28.77-39.69-21.40

Finding the Fourth Proportional to 28.77, 39.69 and 21.40

Calculator

Solution

The fourth proportional to 28.77, 39.69 and 21.40 is: 29.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.77 : 39.69 = 21.40 : x
  2. Step 2: Convert to fraction form
    28.77/39.69 = 21.40/x
  3. Step 3: Cross multiply
    28.77x = 39.69 × 21.40
  4. Step 4: Simplify right side
    28.77x = 849.37
  5. Step 5: Solve for x
    x = 849.37/28.77
  6. Step 6: Final answer
    x = 29.52

Related Problems

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.