Home / 890-1,780

Finding the Third Proportional to 890 and 1,780

Calculator

Solution

The third proportional to 890 and 1,780 is: 3,560

Step by Step Solution

  1. Step 1: Write the proportion equation
    890 : 1,780 = 1,780 : x
  2. Step 2: Convert to fraction form
    890/1,780 = 1,780/x
  3. Step 3: Cross multiply
    890x = 1,780 × 1,780
  4. Step 4: Simplify right side
    890x = 3,168,400
  5. Step 5: Solve for x
    x = 3,168,400/890
  6. Step 6: Final answer
    x = 3,560

Related Problems

Find third proportional to 445 and 890
Half scale
Find third proportional to 1,780 and 3,560
Double scale
Find third proportional to 892 and 1,784
Similar ratio
Find third proportional to 1,335 and 2,670
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.