Home / 218-490

Finding the Third Proportional to 218 and 490

Calculator

Solution

The third proportional to 218 and 490 is: 1,101.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    218 : 490 = 490 : x
  2. Step 2: Convert to fraction form
    218/490 = 490/x
  3. Step 3: Cross multiply
    218x = 490 × 490
  4. Step 4: Simplify right side
    218x = 240,100
  5. Step 5: Solve for x
    x = 240,100/218
  6. Step 6: Final answer
    x = 1,101.38

Related Problems

Find third proportional to 109 and 245
Half scale
Find third proportional to 436 and 980
Double scale
Find third proportional to 220 and 494
Similar ratio
Find third proportional to 327 and 735
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.