Home / 186.79-280.28-84.15

Finding the Fourth Proportional to 186.79, 280.28 and 84.15

Calculator

Solution

The fourth proportional to 186.79, 280.28 and 84.15 is: 126.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.79 : 280.28 = 84.15 : x
  2. Step 2: Convert to fraction form
    186.79/280.28 = 84.15/x
  3. Step 3: Cross multiply
    186.79x = 280.28 × 84.15
  4. Step 4: Simplify right side
    186.79x = 23,585.56
  5. Step 5: Solve for x
    x = 23,585.56/186.79
  6. Step 6: Final answer
    x = 126.27

Related Problems

Find fourth proportional to 93.40, 140.14 and 42.08
Half scale
Find fourth proportional to 373.58, 560.56 and 168.30
Double scale
Find fourth proportional to 187.79, 281.78 and 85.15
Similar ratio
Find fourth proportional to 280.19, 420.42 and 126.23
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.