Home / 208-312-56

Finding the Fourth Proportional to 208, 312 and 56

Calculator

Solution

The fourth proportional to 208, 312 and 56 is: 84

Step by Step Solution

  1. Step 1: Write the proportion equation
    208 : 312 = 56 : x
  2. Step 2: Convert to fraction form
    208/312 = 56/x
  3. Step 3: Cross multiply
    208x = 312 × 56
  4. Step 4: Simplify right side
    208x = 17,472
  5. Step 5: Solve for x
    x = 17,472/208
  6. Step 6: Final answer
    x = 84

Related Problems

Find fourth proportional to 104, 156 and 28
Half scale
Find fourth proportional to 416, 624 and 112
Double scale
Find fourth proportional to 209, 313.50 and 57
Similar ratio
Find fourth proportional to 312, 468 and 84
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.