Home / 142,920-308,439

Finding the Third Proportional to 142,920 and 308,439

Calculator

Solution

The third proportional to 142,920 and 308,439 is: 665,649.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,920 : 308,439 = 308,439 : x
  2. Step 2: Convert to fraction form
    142,920/308,439 = 308,439/x
  3. Step 3: Cross multiply
    142,920x = 308,439 × 308,439
  4. Step 4: Simplify right side
    142,920x = 95,134,616,721
  5. Step 5: Solve for x
    x = 95,134,616,721/142,920
  6. Step 6: Final answer
    x = 665,649.43

Related Problems

Find third proportional to 71,460 and 154,219.50
Half scale
Find third proportional to 285,840 and 616,878
Double scale
Find third proportional to 142,922 and 308,443
Similar ratio
Find third proportional to 214,380 and 462,658.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.