Home / 227.31-312.90-198.15

Finding the Fourth Proportional to 227.31, 312.90 and 198.15

Calculator

Solution

The fourth proportional to 227.31, 312.90 and 198.15 is: 272.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    227.31 : 312.90 = 198.15 : x
  2. Step 2: Convert to fraction form
    227.31/312.90 = 198.15/x
  3. Step 3: Cross multiply
    227.31x = 312.90 × 198.15
  4. Step 4: Simplify right side
    227.31x = 62,000.14
  5. Step 5: Solve for x
    x = 62,000.14/227.31
  6. Step 6: Final answer
    x = 272.76

Related Problems

Find fourth proportional to 113.66, 156.45 and 99.08
Half scale
Find fourth proportional to 454.62, 625.79 and 396.30
Double scale
Find fourth proportional to 228.31, 314.27 and 199.15
Similar ratio
Find fourth proportional to 340.97, 469.34 and 297.23
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.