Home / 393.40-542.64-238

Finding the Fourth Proportional to 393.40, 542.64 and 238

Calculator

Solution

The fourth proportional to 393.40, 542.64 and 238 is: 328.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.40 : 542.64 = 238 : x
  2. Step 2: Convert to fraction form
    393.40/542.64 = 238/x
  3. Step 3: Cross multiply
    393.40x = 542.64 × 238
  4. Step 4: Simplify right side
    393.40x = 129,148.32
  5. Step 5: Solve for x
    x = 129,148.32/393.40
  6. Step 6: Final answer
    x = 328.29

Related Problems

Find fourth proportional to 196.70, 271.32 and 119
Half scale
Find fourth proportional to 786.80, 1,085.28 and 476
Double scale
Find fourth proportional to 394.40, 544.02 and 239
Similar ratio
Find fourth proportional to 590.10, 813.96 and 357
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.