Home / 250.30-345.42-139.78

Finding the Fourth Proportional to 250.30, 345.42 and 139.78

Calculator

Solution

The fourth proportional to 250.30, 345.42 and 139.78 is: 192.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.30 : 345.42 = 139.78 : x
  2. Step 2: Convert to fraction form
    250.30/345.42 = 139.78/x
  3. Step 3: Cross multiply
    250.30x = 345.42 × 139.78
  4. Step 4: Simplify right side
    250.30x = 48,282.81
  5. Step 5: Solve for x
    x = 48,282.81/250.30
  6. Step 6: Final answer
    x = 192.90

Related Problems

Find fourth proportional to 125.15, 172.71 and 69.89
Half scale
Find fourth proportional to 500.60, 690.84 and 279.56
Double scale
Find fourth proportional to 251.30, 346.80 and 140.78
Similar ratio
Find fourth proportional to 375.45, 518.13 and 209.67
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.