Home / 138,300-297,620

Finding the Third Proportional to 138,300 and 297,620

Calculator

Solution

The third proportional to 138,300 and 297,620 is: 640,474.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,300 : 297,620 = 297,620 : x
  2. Step 2: Convert to fraction form
    138,300/297,620 = 297,620/x
  3. Step 3: Cross multiply
    138,300x = 297,620 × 297,620
  4. Step 4: Simplify right side
    138,300x = 88,577,664,400
  5. Step 5: Solve for x
    x = 88,577,664,400/138,300
  6. Step 6: Final answer
    x = 640,474.80

Related Problems

Find third proportional to 69,150 and 148,810
Half scale
Find third proportional to 276,600 and 595,240
Double scale
Find third proportional to 138,302 and 297,624
Similar ratio
Find third proportional to 207,450 and 446,430
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.