Home / 151.90-209.56-102.79

Finding the Fourth Proportional to 151.90, 209.56 and 102.79

Calculator

Solution

The fourth proportional to 151.90, 209.56 and 102.79 is: 141.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.90 : 209.56 = 102.79 : x
  2. Step 2: Convert to fraction form
    151.90/209.56 = 102.79/x
  3. Step 3: Cross multiply
    151.90x = 209.56 × 102.79
  4. Step 4: Simplify right side
    151.90x = 21,540.67
  5. Step 5: Solve for x
    x = 21,540.67/151.90
  6. Step 6: Final answer
    x = 141.81

Related Problems

Find fourth proportional to 75.95, 104.78 and 51.40
Half scale
Find fourth proportional to 303.80, 419.12 and 205.58
Double scale
Find fourth proportional to 152.90, 210.94 and 103.79
Similar ratio
Find fourth proportional to 227.85, 314.34 and 154.19
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.