Home / 581.40-872.12-191.40

Finding the Fourth Proportional to 581.40, 872.12 and 191.40

Calculator

Solution

The fourth proportional to 581.40, 872.12 and 191.40 is: 287.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.40 : 872.12 = 191.40 : x
  2. Step 2: Convert to fraction form
    581.40/872.12 = 191.40/x
  3. Step 3: Cross multiply
    581.40x = 872.12 × 191.40
  4. Step 4: Simplify right side
    581.40x = 166,922.81
  5. Step 5: Solve for x
    x = 166,922.81/581.40
  6. Step 6: Final answer
    x = 287.10

Related Problems

Find fourth proportional to 290.70, 436.06 and 95.70
Half scale
Find fourth proportional to 1,162.80, 1,744.23 and 382.80
Double scale
Find fourth proportional to 582.40, 873.62 and 192.40
Similar ratio
Find fourth proportional to 872.10, 1,308.17 and 287.10
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.