Home / 155-213.56-105.79

Finding the Fourth Proportional to 155, 213.56 and 105.79

Calculator

Solution

The fourth proportional to 155, 213.56 and 105.79 is: 145.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    155 : 213.56 = 105.79 : x
  2. Step 2: Convert to fraction form
    155/213.56 = 105.79/x
  3. Step 3: Cross multiply
    155x = 213.56 × 105.79
  4. Step 4: Simplify right side
    155x = 22,592.51
  5. Step 5: Solve for x
    x = 22,592.51/155
  6. Step 6: Final answer
    x = 145.76

Related Problems

Find fourth proportional to 77.50, 106.78 and 52.90
Half scale
Find fourth proportional to 310, 427.12 and 211.58
Double scale
Find fourth proportional to 156, 214.94 and 106.79
Similar ratio
Find fourth proportional to 232.50, 320.34 and 158.69
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.