Home / 217-325.50-135.80

Finding the Fourth Proportional to 217, 325.50 and 135.80

Calculator

Solution

The fourth proportional to 217, 325.50 and 135.80 is: 203.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    217 : 325.50 = 135.80 : x
  2. Step 2: Convert to fraction form
    217/325.50 = 135.80/x
  3. Step 3: Cross multiply
    217x = 325.50 × 135.80
  4. Step 4: Simplify right side
    217x = 44,202.90
  5. Step 5: Solve for x
    x = 44,202.90/217
  6. Step 6: Final answer
    x = 203.70

Related Problems

Find fourth proportional to 108.50, 162.75 and 67.90
Half scale
Find fourth proportional to 434, 651 and 271.60
Double scale
Find fourth proportional to 218, 327 and 136.80
Similar ratio
Find fourth proportional to 325.50, 488.25 and 203.70
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.