Home / 110.79-153-72

Finding the Fourth Proportional to 110.79, 153 and 72

Calculator

Solution

The fourth proportional to 110.79, 153 and 72 is: 99.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.79 : 153 = 72 : x
  2. Step 2: Convert to fraction form
    110.79/153 = 72/x
  3. Step 3: Cross multiply
    110.79x = 153 × 72
  4. Step 4: Simplify right side
    110.79x = 11,016
  5. Step 5: Solve for x
    x = 11,016/110.79
  6. Step 6: Final answer
    x = 99.43

Related Problems

Find fourth proportional to 55.40, 76.50 and 36
Half scale
Find fourth proportional to 221.58, 306 and 144
Double scale
Find fourth proportional to 111.79, 154.38 and 73
Similar ratio
Find fourth proportional to 166.19, 229.50 and 108
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.