Home / 389,920-521,551

Finding the Third Proportional to 389,920 and 521,551

Calculator

Solution

The third proportional to 389,920 and 521,551 is: 697,618.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,920 : 521,551 = 521,551 : x
  2. Step 2: Convert to fraction form
    389,920/521,551 = 521,551/x
  3. Step 3: Cross multiply
    389,920x = 521,551 × 521,551
  4. Step 4: Simplify right side
    389,920x = 272,015,445,601
  5. Step 5: Solve for x
    x = 272,015,445,601/389,920
  6. Step 6: Final answer
    x = 697,618.60

Related Problems

Find third proportional to 194,960 and 260,775.50
Half scale
Find third proportional to 779,840 and 1,043,102
Double scale
Find third proportional to 389,922 and 521,554
Similar ratio
Find third proportional to 584,880 and 782,326.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.