Home / 278,738-420,718

Finding the Third Proportional to 278,738 and 420,718

Calculator

Solution

The third proportional to 278,738 and 420,718 is: 635,017.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,738 : 420,718 = 420,718 : x
  2. Step 2: Convert to fraction form
    278,738/420,718 = 420,718/x
  3. Step 3: Cross multiply
    278,738x = 420,718 × 420,718
  4. Step 4: Simplify right side
    278,738x = 177,003,635,524
  5. Step 5: Solve for x
    x = 177,003,635,524/278,738
  6. Step 6: Final answer
    x = 635,017.96

Related Problems

Find third proportional to 139,369 and 210,359
Half scale
Find third proportional to 557,476 and 841,436
Double scale
Find third proportional to 278,740 and 420,721
Similar ratio
Find third proportional to 418,107 and 631,077
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.