Home / 160.40-221.30-113.78

Finding the Fourth Proportional to 160.40, 221.30 and 113.78

Calculator

Solution

The fourth proportional to 160.40, 221.30 and 113.78 is: 156.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.40 : 221.30 = 113.78 : x
  2. Step 2: Convert to fraction form
    160.40/221.30 = 113.78/x
  3. Step 3: Cross multiply
    160.40x = 221.30 × 113.78
  4. Step 4: Simplify right side
    160.40x = 25,179.51
  5. Step 5: Solve for x
    x = 25,179.51/160.40
  6. Step 6: Final answer
    x = 156.98

Related Problems

Find fourth proportional to 80.20, 110.65 and 56.89
Half scale
Find fourth proportional to 320.80, 442.60 and 227.56
Double scale
Find fourth proportional to 161.40, 222.68 and 114.78
Similar ratio
Find fourth proportional to 240.60, 331.95 and 170.67
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.