Home / 191.31-287.07-100

Finding the Fourth Proportional to 191.31, 287.07 and 100

Calculator

Solution

The fourth proportional to 191.31, 287.07 and 100 is: 150.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.31 : 287.07 = 100 : x
  2. Step 2: Convert to fraction form
    191.31/287.07 = 100/x
  3. Step 3: Cross multiply
    191.31x = 287.07 × 100
  4. Step 4: Simplify right side
    191.31x = 28,707
  5. Step 5: Solve for x
    x = 28,707/191.31
  6. Step 6: Final answer
    x = 150.05

Related Problems

Find fourth proportional to 95.66, 143.54 and 50
Half scale
Find fourth proportional to 382.62, 574.14 and 200
Double scale
Find fourth proportional to 192.31, 288.57 and 101
Similar ratio
Find fourth proportional to 286.97, 430.61 and 150
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.