Home / 183.78-253.73-128.42

Finding the Fourth Proportional to 183.78, 253.73 and 128.42

Calculator

Solution

The fourth proportional to 183.78, 253.73 and 128.42 is: 177.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    183.78 : 253.73 = 128.42 : x
  2. Step 2: Convert to fraction form
    183.78/253.73 = 128.42/x
  3. Step 3: Cross multiply
    183.78x = 253.73 × 128.42
  4. Step 4: Simplify right side
    183.78x = 32,584.01
  5. Step 5: Solve for x
    x = 32,584.01/183.78
  6. Step 6: Final answer
    x = 177.30

Related Problems

Find fourth proportional to 91.89, 126.87 and 64.21
Half scale
Find fourth proportional to 367.56, 507.46 and 256.84
Double scale
Find fourth proportional to 184.78, 255.11 and 129.42
Similar ratio
Find fourth proportional to 275.67, 380.60 and 192.63
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.