Home / 292.21-438.31-75.78

Finding the Fourth Proportional to 292.21, 438.31 and 75.78

Calculator

Solution

The fourth proportional to 292.21, 438.31 and 75.78 is: 113.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.21 : 438.31 = 75.78 : x
  2. Step 2: Convert to fraction form
    292.21/438.31 = 75.78/x
  3. Step 3: Cross multiply
    292.21x = 438.31 × 75.78
  4. Step 4: Simplify right side
    292.21x = 33,216.87
  5. Step 5: Solve for x
    x = 33,216.87/292.21
  6. Step 6: Final answer
    x = 113.68

Related Problems

Find fourth proportional to 146.10, 219.16 and 37.89
Half scale
Find fourth proportional to 584.42, 876.62 and 151.57
Double scale
Find fourth proportional to 293.21, 439.81 and 76.78
Similar ratio
Find fourth proportional to 438.31, 657.47 and 113.68
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.