Home / 238.78-329.44-145.49

Finding the Fourth Proportional to 238.78, 329.44 and 145.49

Calculator

Solution

The fourth proportional to 238.78, 329.44 and 145.49 is: 200.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.78 : 329.44 = 145.49 : x
  2. Step 2: Convert to fraction form
    238.78/329.44 = 145.49/x
  3. Step 3: Cross multiply
    238.78x = 329.44 × 145.49
  4. Step 4: Simplify right side
    238.78x = 47,930.69
  5. Step 5: Solve for x
    x = 47,930.69/238.78
  6. Step 6: Final answer
    x = 200.73

Related Problems

Find fourth proportional to 119.39, 164.72 and 72.75
Half scale
Find fourth proportional to 477.56, 658.88 and 290.99
Double scale
Find fourth proportional to 239.78, 330.82 and 146.49
Similar ratio
Find fourth proportional to 358.17, 494.16 and 218.24
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.