Home / 135.40-202.89-89.78

Finding the Fourth Proportional to 135.40, 202.89 and 89.78

Calculator

Solution

The fourth proportional to 135.40, 202.89 and 89.78 is: 134.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.40 : 202.89 = 89.78 : x
  2. Step 2: Convert to fraction form
    135.40/202.89 = 89.78/x
  3. Step 3: Cross multiply
    135.40x = 202.89 × 89.78
  4. Step 4: Simplify right side
    135.40x = 18,215.46
  5. Step 5: Solve for x
    x = 18,215.46/135.40
  6. Step 6: Final answer
    x = 134.53

Related Problems

Find fourth proportional to 67.70, 101.45 and 44.89
Half scale
Find fourth proportional to 270.80, 405.78 and 179.56
Double scale
Find fourth proportional to 136.40, 204.39 and 90.78
Similar ratio
Find fourth proportional to 203.10, 304.34 and 134.67
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.