Home / 990.38-1,080.38

Finding the Third Proportional to 990.38 and 1,080.38

Calculator

Solution

The third proportional to 990.38 and 1,080.38 is: 1,178.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.38 : 1,080.38 = 1,080.38 : x
  2. Step 2: Convert to fraction form
    990.38/1,080.38 = 1,080.38/x
  3. Step 3: Cross multiply
    990.38x = 1,080.38 × 1,080.38
  4. Step 4: Simplify right side
    990.38x = 1,167,210.14
  5. Step 5: Solve for x
    x = 1,167,210.14/990.38
  6. Step 6: Final answer
    x = 1,178.55

Related Problems

Find third proportional to 495.19 and 540.19
Half scale
Find third proportional to 1,980.75 and 2,160.75
Double scale
Find third proportional to 992 and 1,083
Similar ratio
Find third proportional to 1,485.56 and 1,620.56
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.