Home / 249.78-374.54-128.19

Finding the Fourth Proportional to 249.78, 374.54 and 128.19

Calculator

Solution

The fourth proportional to 249.78, 374.54 and 128.19 is: 192.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.78 : 374.54 = 128.19 : x
  2. Step 2: Convert to fraction form
    249.78/374.54 = 128.19/x
  3. Step 3: Cross multiply
    249.78x = 374.54 × 128.19
  4. Step 4: Simplify right side
    249.78x = 48,011.64
  5. Step 5: Solve for x
    x = 48,011.64/249.78
  6. Step 6: Final answer
    x = 192.22

Related Problems

Find fourth proportional to 124.89, 187.27 and 64.10
Half scale
Find fourth proportional to 499.56, 749.07 and 256.38
Double scale
Find fourth proportional to 250.78, 376.03 and 129.19
Similar ratio
Find fourth proportional to 374.67, 561.80 and 192.29
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.