Home / 321,290-678,748

Finding the Third Proportional to 321,290 and 678,748

Calculator

Solution

The third proportional to 321,290 and 678,748 is: 1,433,903.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,290 : 678,748 = 678,748 : x
  2. Step 2: Convert to fraction form
    321,290/678,748 = 678,748/x
  3. Step 3: Cross multiply
    321,290x = 678,748 × 678,748
  4. Step 4: Simplify right side
    321,290x = 460,698,847,504
  5. Step 5: Solve for x
    x = 460,698,847,504/321,290
  6. Step 6: Final answer
    x = 1,433,903.48

Related Problems

Find third proportional to 160,645 and 339,374
Half scale
Find third proportional to 642,580 and 1,357,496
Double scale
Find third proportional to 321,292 and 678,752
Similar ratio
Find third proportional to 481,935 and 1,018,122
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.