Home / 890-1,335-240.74

Finding the Fourth Proportional to 890, 1,335 and 240.74

Calculator

Solution

The fourth proportional to 890, 1,335 and 240.74 is: 361.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    890 : 1,335 = 240.74 : x
  2. Step 2: Convert to fraction form
    890/1,335 = 240.74/x
  3. Step 3: Cross multiply
    890x = 1,335 × 240.74
  4. Step 4: Simplify right side
    890x = 321,387.90
  5. Step 5: Solve for x
    x = 321,387.90/890
  6. Step 6: Final answer
    x = 361.11

Related Problems

Find fourth proportional to 445, 667.50 and 120.37
Half scale
Find fourth proportional to 1,780, 2,670 and 481.48
Double scale
Find fourth proportional to 891, 1,336.50 and 241.74
Similar ratio
Find fourth proportional to 1,335, 2,002.50 and 361.11
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.