Home / 191.28-286.85-139.79

Finding the Fourth Proportional to 191.28, 286.85 and 139.79

Calculator

Solution

The fourth proportional to 191.28, 286.85 and 139.79 is: 209.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.28 : 286.85 = 139.79 : x
  2. Step 2: Convert to fraction form
    191.28/286.85 = 139.79/x
  3. Step 3: Cross multiply
    191.28x = 286.85 × 139.79
  4. Step 4: Simplify right side
    191.28x = 40,096.63
  5. Step 5: Solve for x
    x = 40,096.63/191.28
  6. Step 6: Final answer
    x = 209.62

Related Problems

Find fourth proportional to 95.64, 143.42 and 69.89
Half scale
Find fourth proportional to 382.56, 573.69 and 279.57
Double scale
Find fourth proportional to 192.28, 288.34 and 140.79
Similar ratio
Find fourth proportional to 286.92, 430.27 and 209.68
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.