Home / 421,522-642,778

Finding the Third Proportional to 421,522 and 642,778

Calculator

Solution

The third proportional to 421,522 and 642,778 is: 980,170.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,522 : 642,778 = 642,778 : x
  2. Step 2: Convert to fraction form
    421,522/642,778 = 642,778/x
  3. Step 3: Cross multiply
    421,522x = 642,778 × 642,778
  4. Step 4: Simplify right side
    421,522x = 413,163,557,284
  5. Step 5: Solve for x
    x = 413,163,557,284/421,522
  6. Step 6: Final answer
    x = 980,170.80

Related Problems

Find third proportional to 210,761 and 321,389
Half scale
Find third proportional to 843,044 and 1,285,556
Double scale
Find third proportional to 421,524 and 642,781
Similar ratio
Find third proportional to 632,283 and 964,167
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.