Home / 308,454-420,215

Finding the Third Proportional to 308,454 and 420,215

Calculator

Solution

The third proportional to 308,454 and 420,215 is: 572,469.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,454 : 420,215 = 420,215 : x
  2. Step 2: Convert to fraction form
    308,454/420,215 = 420,215/x
  3. Step 3: Cross multiply
    308,454x = 420,215 × 420,215
  4. Step 4: Simplify right side
    308,454x = 176,580,646,225
  5. Step 5: Solve for x
    x = 176,580,646,225/308,454
  6. Step 6: Final answer
    x = 572,469.95

Related Problems

Find third proportional to 154,227 and 210,107.50
Half scale
Find third proportional to 616,908 and 840,430
Double scale
Find third proportional to 308,456 and 420,218
Similar ratio
Find third proportional to 462,681 and 630,322.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.