Home / 138,974-299,980

Finding the Third Proportional to 138,974 and 299,980

Calculator

Solution

The third proportional to 138,974 and 299,980 is: 647,516.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,974 : 299,980 = 299,980 : x
  2. Step 2: Convert to fraction form
    138,974/299,980 = 299,980/x
  3. Step 3: Cross multiply
    138,974x = 299,980 × 299,980
  4. Step 4: Simplify right side
    138,974x = 89,988,000,400
  5. Step 5: Solve for x
    x = 89,988,000,400/138,974
  6. Step 6: Final answer
    x = 647,516.80

Related Problems

Find third proportional to 69,487 and 149,990
Half scale
Find third proportional to 277,948 and 599,960
Double scale
Find third proportional to 138,976 and 299,984
Similar ratio
Find third proportional to 208,461 and 449,970
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.