Home / 248.85-343.38-138.30

Finding the Fourth Proportional to 248.85, 343.38 and 138.30

Calculator

Solution

The fourth proportional to 248.85, 343.38 and 138.30 is: 190.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.85 : 343.38 = 138.30 : x
  2. Step 2: Convert to fraction form
    248.85/343.38 = 138.30/x
  3. Step 3: Cross multiply
    248.85x = 343.38 × 138.30
  4. Step 4: Simplify right side
    248.85x = 47,489.45
  5. Step 5: Solve for x
    x = 47,489.45/248.85
  6. Step 6: Final answer
    x = 190.84

Related Problems

Find fourth proportional to 124.43, 171.69 and 69.15
Half scale
Find fourth proportional to 497.70, 686.76 and 276.60
Double scale
Find fourth proportional to 249.85, 344.76 and 139.30
Similar ratio
Find fourth proportional to 373.28, 515.07 and 207.45
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.