Home / 318-438.90-180

Finding the Fourth Proportional to 318, 438.90 and 180

Calculator

Solution

The fourth proportional to 318, 438.90 and 180 is: 248.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    318 : 438.90 = 180 : x
  2. Step 2: Convert to fraction form
    318/438.90 = 180/x
  3. Step 3: Cross multiply
    318x = 438.90 × 180
  4. Step 4: Simplify right side
    318x = 79,002
  5. Step 5: Solve for x
    x = 79,002/318
  6. Step 6: Final answer
    x = 248.43

Related Problems

Find fourth proportional to 159, 219.45 and 90
Half scale
Find fourth proportional to 636, 877.80 and 360
Double scale
Find fourth proportional to 319, 440.28 and 181
Similar ratio
Find fourth proportional to 477, 658.35 and 270
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.