Home / 398-549.24-242.78

Finding the Fourth Proportional to 398, 549.24 and 242.78

Calculator

Solution

The fourth proportional to 398, 549.24 and 242.78 is: 335.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    398 : 549.24 = 242.78 : x
  2. Step 2: Convert to fraction form
    398/549.24 = 242.78/x
  3. Step 3: Cross multiply
    398x = 549.24 × 242.78
  4. Step 4: Simplify right side
    398x = 133,344.49
  5. Step 5: Solve for x
    x = 133,344.49/398
  6. Step 6: Final answer
    x = 335.04

Related Problems

Find fourth proportional to 199, 274.62 and 121.39
Half scale
Find fourth proportional to 796, 1,098.48 and 485.56
Double scale
Find fourth proportional to 399, 550.62 and 243.78
Similar ratio
Find fourth proportional to 597, 823.86 and 364.17
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.