Home / 151.78-209.55-105.13

Finding the Fourth Proportional to 151.78, 209.55 and 105.13

Calculator

Solution

The fourth proportional to 151.78, 209.55 and 105.13 is: 145.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.78 : 209.55 = 105.13 : x
  2. Step 2: Convert to fraction form
    151.78/209.55 = 105.13/x
  3. Step 3: Cross multiply
    151.78x = 209.55 × 105.13
  4. Step 4: Simplify right side
    151.78x = 22,031.04
  5. Step 5: Solve for x
    x = 22,031.04/151.78
  6. Step 6: Final answer
    x = 145.15

Related Problems

Find fourth proportional to 75.89, 104.78 and 52.57
Half scale
Find fourth proportional to 303.56, 419.10 and 210.27
Double scale
Find fourth proportional to 152.78, 210.93 and 106.13
Similar ratio
Find fourth proportional to 227.67, 314.33 and 157.70
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.