Home / 248.61-372.45-221.28

Finding the Fourth Proportional to 248.61, 372.45 and 221.28

Calculator

Solution

The fourth proportional to 248.61, 372.45 and 221.28 is: 331.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.61 : 372.45 = 221.28 : x
  2. Step 2: Convert to fraction form
    248.61/372.45 = 221.28/x
  3. Step 3: Cross multiply
    248.61x = 372.45 × 221.28
  4. Step 4: Simplify right side
    248.61x = 82,415.74
  5. Step 5: Solve for x
    x = 82,415.74/248.61
  6. Step 6: Final answer
    x = 331.51

Related Problems

Find fourth proportional to 124.31, 186.23 and 110.64
Half scale
Find fourth proportional to 497.22, 744.90 and 442.56
Double scale
Find fourth proportional to 249.61, 373.95 and 222.28
Similar ratio
Find fourth proportional to 372.92, 558.68 and 331.92
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.