Home / 990-1,539

Finding the Third Proportional to 990 and 1,539

Calculator

Solution

The third proportional to 990 and 1,539 is: 2,392.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    990 : 1,539 = 1,539 : x
  2. Step 2: Convert to fraction form
    990/1,539 = 1,539/x
  3. Step 3: Cross multiply
    990x = 1,539 × 1,539
  4. Step 4: Simplify right side
    990x = 2,368,521
  5. Step 5: Solve for x
    x = 2,368,521/990
  6. Step 6: Final answer
    x = 2,392.45

Related Problems

Find third proportional to 495 and 769.50
Half scale
Find third proportional to 1,980 and 3,078
Double scale
Find third proportional to 992 and 1,542
Similar ratio
Find third proportional to 1,485 and 2,308.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.