Home / 248.78-343.30-155.56

Finding the Fourth Proportional to 248.78, 343.30 and 155.56

Calculator

Solution

The fourth proportional to 248.78, 343.30 and 155.56 is: 214.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.78 : 343.30 = 155.56 : x
  2. Step 2: Convert to fraction form
    248.78/343.30 = 155.56/x
  3. Step 3: Cross multiply
    248.78x = 343.30 × 155.56
  4. Step 4: Simplify right side
    248.78x = 53,403.75
  5. Step 5: Solve for x
    x = 53,403.75/248.78
  6. Step 6: Final answer
    x = 214.66

Related Problems

Find fourth proportional to 124.39, 171.65 and 77.78
Half scale
Find fourth proportional to 497.56, 686.60 and 311.12
Double scale
Find fourth proportional to 249.78, 344.68 and 156.56
Similar ratio
Find fourth proportional to 373.17, 514.95 and 233.34
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.