Home / 269.14-403.71-76.78

Finding the Fourth Proportional to 269.14, 403.71 and 76.78

Calculator

Solution

The fourth proportional to 269.14, 403.71 and 76.78 is: 115.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.14 : 403.71 = 76.78 : x
  2. Step 2: Convert to fraction form
    269.14/403.71 = 76.78/x
  3. Step 3: Cross multiply
    269.14x = 403.71 × 76.78
  4. Step 4: Simplify right side
    269.14x = 30,996.85
  5. Step 5: Solve for x
    x = 30,996.85/269.14
  6. Step 6: Final answer
    x = 115.17

Related Problems

Find fourth proportional to 134.57, 201.86 and 38.39
Half scale
Find fourth proportional to 538.28, 807.42 and 153.56
Double scale
Find fourth proportional to 270.14, 405.21 and 77.78
Similar ratio
Find fourth proportional to 403.71, 605.57 and 115.17
1.5x scale

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.