Home / 190.71-285.84-87.90

Finding the Fourth Proportional to 190.71, 285.84 and 87.90

Calculator

Solution

The fourth proportional to 190.71, 285.84 and 87.90 is: 131.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.71 : 285.84 = 87.90 : x
  2. Step 2: Convert to fraction form
    190.71/285.84 = 87.90/x
  3. Step 3: Cross multiply
    190.71x = 285.84 × 87.90
  4. Step 4: Simplify right side
    190.71x = 25,125.34
  5. Step 5: Solve for x
    x = 25,125.34/190.71
  6. Step 6: Final answer
    x = 131.75

Related Problems

Find fourth proportional to 95.36, 142.92 and 43.95
Half scale
Find fourth proportional to 381.42, 571.68 and 175.80
Double scale
Find fourth proportional to 191.71, 287.34 and 88.90
Similar ratio
Find fourth proportional to 286.07, 428.76 and 131.85
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.