Home / 55,370-129,990

Finding the Third Proportional to 55,370 and 129,990

Calculator

Solution

The third proportional to 55,370 and 129,990 is: 305,172.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,370 : 129,990 = 129,990 : x
  2. Step 2: Convert to fraction form
    55,370/129,990 = 129,990/x
  3. Step 3: Cross multiply
    55,370x = 129,990 × 129,990
  4. Step 4: Simplify right side
    55,370x = 16,897,400,100
  5. Step 5: Solve for x
    x = 16,897,400,100/55,370
  6. Step 6: Final answer
    x = 305,172.48

Related Problems

Find third proportional to 27,685 and 64,995
Half scale
Find third proportional to 110,740 and 259,980
Double scale
Find third proportional to 55,372 and 129,995
Similar ratio
Find third proportional to 83,055 and 194,985
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.