Home / 185.79-256.40-102.90

Finding the Fourth Proportional to 185.79, 256.40 and 102.90

Calculator

Solution

The fourth proportional to 185.79, 256.40 and 102.90 is: 142.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.79 : 256.40 = 102.90 : x
  2. Step 2: Convert to fraction form
    185.79/256.40 = 102.90/x
  3. Step 3: Cross multiply
    185.79x = 256.40 × 102.90
  4. Step 4: Simplify right side
    185.79x = 26,383.56
  5. Step 5: Solve for x
    x = 26,383.56/185.79
  6. Step 6: Final answer
    x = 142.01

Related Problems

Find fourth proportional to 92.90, 128.20 and 51.45
Half scale
Find fourth proportional to 371.58, 512.80 and 205.80
Double scale
Find fourth proportional to 186.79, 257.78 and 103.90
Similar ratio
Find fourth proportional to 278.69, 384.60 and 154.35
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.