Home / 219-288

Finding the Third Proportional to 219 and 288

Calculator

Solution

The third proportional to 219 and 288 is: 378.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    219 : 288 = 288 : x
  2. Step 2: Convert to fraction form
    219/288 = 288/x
  3. Step 3: Cross multiply
    219x = 288 × 288
  4. Step 4: Simplify right side
    219x = 82,944
  5. Step 5: Solve for x
    x = 82,944/219
  6. Step 6: Final answer
    x = 378.74

Related Problems

Find third proportional to 109.50 and 144
Half scale
Find third proportional to 438 and 576
Double scale
Find third proportional to 221 and 291
Similar ratio
Find third proportional to 328.50 and 432
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.