Home / 200.25-420.19

Finding the Third Proportional to 200.25 and 420.19

Calculator

Solution

The third proportional to 200.25 and 420.19 is: 881.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.25 : 420.19 = 420.19 : x
  2. Step 2: Convert to fraction form
    200.25/420.19 = 420.19/x
  3. Step 3: Cross multiply
    200.25x = 420.19 × 420.19
  4. Step 4: Simplify right side
    200.25x = 176,557.54
  5. Step 5: Solve for x
    x = 176,557.54/200.25
  6. Step 6: Final answer
    x = 881.69

Related Problems

Find third proportional to 100.13 and 210.09
Half scale
Find third proportional to 400.50 and 840.38
Double scale
Find third proportional to 202 and 424
Similar ratio
Find third proportional to 300.38 and 630.28
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.