Home / 1,387-2,990

Finding the Third Proportional to 1,387 and 2,990

Calculator

Solution

The third proportional to 1,387 and 2,990 is: 6,445.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387 : 2,990 = 2,990 : x
  2. Step 2: Convert to fraction form
    1,387/2,990 = 2,990/x
  3. Step 3: Cross multiply
    1,387x = 2,990 × 2,990
  4. Step 4: Simplify right side
    1,387x = 8,940,100
  5. Step 5: Solve for x
    x = 8,940,100/1,387
  6. Step 6: Final answer
    x = 6,445.64

Related Problems

Find third proportional to 693.50 and 1,495
Half scale
Find third proportional to 2,774 and 5,980
Double scale
Find third proportional to 1,389 and 2,994
Similar ratio
Find third proportional to 2,080.50 and 4,485
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.