Home / 293.80-440.70-257.80

Finding the Fourth Proportional to 293.80, 440.70 and 257.80

Calculator

Solution

The fourth proportional to 293.80, 440.70 and 257.80 is: 386.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    293.80 : 440.70 = 257.80 : x
  2. Step 2: Convert to fraction form
    293.80/440.70 = 257.80/x
  3. Step 3: Cross multiply
    293.80x = 440.70 × 257.80
  4. Step 4: Simplify right side
    293.80x = 113,612.46
  5. Step 5: Solve for x
    x = 113,612.46/293.80
  6. Step 6: Final answer
    x = 386.70

Related Problems

Find fourth proportional to 146.90, 220.35 and 128.90
Half scale
Find fourth proportional to 587.60, 881.40 and 515.60
Double scale
Find fourth proportional to 294.80, 442.20 and 258.80
Similar ratio
Find fourth proportional to 440.70, 661.05 and 386.70
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.