Home / 28.80-39.68-26

Finding the Fourth Proportional to 28.80, 39.68 and 26

Calculator

Solution

The fourth proportional to 28.80, 39.68 and 26 is: 35.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.80 : 39.68 = 26 : x
  2. Step 2: Convert to fraction form
    28.80/39.68 = 26/x
  3. Step 3: Cross multiply
    28.80x = 39.68 × 26
  4. Step 4: Simplify right side
    28.80x = 1,031.68
  5. Step 5: Solve for x
    x = 1,031.68/28.80
  6. Step 6: Final answer
    x = 35.82

Related Problems

Find fourth proportional to 14.40, 19.84 and 13
Half scale
Find fourth proportional to 57.60, 79.36 and 52
Double scale
Find fourth proportional to 29.80, 41.06 and 27
Similar ratio
Find fourth proportional to 43.20, 59.52 and 39
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.