Home / 321,138-699,480

Finding the Third Proportional to 321,138 and 699,480

Calculator

Solution

The third proportional to 321,138 and 699,480 is: 1,523,557.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,138 : 699,480 = 699,480 : x
  2. Step 2: Convert to fraction form
    321,138/699,480 = 699,480/x
  3. Step 3: Cross multiply
    321,138x = 699,480 × 699,480
  4. Step 4: Simplify right side
    321,138x = 489,272,270,400
  5. Step 5: Solve for x
    x = 489,272,270,400/321,138
  6. Step 6: Final answer
    x = 1,523,557.69

Related Problems

Find third proportional to 160,569 and 349,740
Half scale
Find third proportional to 642,276 and 1,398,960
Double scale
Find third proportional to 321,140 and 699,484
Similar ratio
Find third proportional to 481,707 and 1,049,220
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.