Home / 309.21-426.62-191.21

Finding the Fourth Proportional to 309.21, 426.62 and 191.21

Calculator

Solution

The fourth proportional to 309.21, 426.62 and 191.21 is: 263.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.21 : 426.62 = 191.21 : x
  2. Step 2: Convert to fraction form
    309.21/426.62 = 191.21/x
  3. Step 3: Cross multiply
    309.21x = 426.62 × 191.21
  4. Step 4: Simplify right side
    309.21x = 81,570.92
  5. Step 5: Solve for x
    x = 81,570.92/309.21
  6. Step 6: Final answer
    x = 263.80

Related Problems

Find fourth proportional to 154.61, 213.31 and 95.60
Half scale
Find fourth proportional to 618.42, 853.23 and 382.41
Double scale
Find fourth proportional to 310.21, 427.99 and 192.21
Similar ratio
Find fourth proportional to 463.82, 639.92 and 286.81
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.