Home / 669.20-1,389.66

Finding the Third Proportional to 669.20 and 1,389.66

Calculator

Solution

The third proportional to 669.20 and 1,389.66 is: 2,885.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.20 : 1,389.66 = 1,389.66 : x
  2. Step 2: Convert to fraction form
    669.20/1,389.66 = 1,389.66/x
  3. Step 3: Cross multiply
    669.20x = 1,389.66 × 1,389.66
  4. Step 4: Simplify right side
    669.20x = 1,931,144.49
  5. Step 5: Solve for x
    x = 1,931,144.49/669.20
  6. Step 6: Final answer
    x = 2,885.75

Related Problems

Find third proportional to 334.60 and 694.83
Half scale
Find third proportional to 1,338.40 and 2,779.31
Double scale
Find third proportional to 671 and 1,394
Similar ratio
Find third proportional to 1,003.80 and 2,084.48
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.