Home / 395.40-545.40-240

Finding the Fourth Proportional to 395.40, 545.40 and 240

Calculator

Solution

The fourth proportional to 395.40, 545.40 and 240 is: 331.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.40 : 545.40 = 240 : x
  2. Step 2: Convert to fraction form
    395.40/545.40 = 240/x
  3. Step 3: Cross multiply
    395.40x = 545.40 × 240
  4. Step 4: Simplify right side
    395.40x = 130,896
  5. Step 5: Solve for x
    x = 130,896/395.40
  6. Step 6: Final answer
    x = 331.05

Related Problems

Find fourth proportional to 197.70, 272.70 and 120
Half scale
Find fourth proportional to 790.80, 1,090.80 and 480
Double scale
Find fourth proportional to 396.40, 546.78 and 241
Similar ratio
Find fourth proportional to 593.10, 818.10 and 360
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.