Home / 318,312-690,872

Finding the Third Proportional to 318,312 and 690,872

Calculator

Solution

The third proportional to 318,312 and 690,872 is: 1,499,485.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,312 : 690,872 = 690,872 : x
  2. Step 2: Convert to fraction form
    318,312/690,872 = 690,872/x
  3. Step 3: Cross multiply
    318,312x = 690,872 × 690,872
  4. Step 4: Simplify right side
    318,312x = 477,304,120,384
  5. Step 5: Solve for x
    x = 477,304,120,384/318,312
  6. Step 6: Final answer
    x = 1,499,485.16

Related Problems

Find third proportional to 159,156 and 345,436
Half scale
Find third proportional to 636,624 and 1,381,744
Double scale
Find third proportional to 318,314 and 690,876
Similar ratio
Find third proportional to 477,468 and 1,036,308
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.