Home / 177.28-243.64-138.40

Finding the Fourth Proportional to 177.28, 243.64 and 138.40

Calculator

Solution

The fourth proportional to 177.28, 243.64 and 138.40 is: 190.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.28 : 243.64 = 138.40 : x
  2. Step 2: Convert to fraction form
    177.28/243.64 = 138.40/x
  3. Step 3: Cross multiply
    177.28x = 243.64 × 138.40
  4. Step 4: Simplify right side
    177.28x = 33,719.78
  5. Step 5: Solve for x
    x = 33,719.78/177.28
  6. Step 6: Final answer
    x = 190.21

Related Problems

Find fourth proportional to 88.64, 121.82 and 69.20
Half scale
Find fourth proportional to 354.56, 487.28 and 276.80
Double scale
Find fourth proportional to 178.28, 245.01 and 139.40
Similar ratio
Find fourth proportional to 265.92, 365.46 and 207.60
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.