Home / 285,138-398,639

Finding the Third Proportional to 285,138 and 398,639

Calculator

Solution

The third proportional to 285,138 and 398,639 is: 557,319.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,138 : 398,639 = 398,639 : x
  2. Step 2: Convert to fraction form
    285,138/398,639 = 398,639/x
  3. Step 3: Cross multiply
    285,138x = 398,639 × 398,639
  4. Step 4: Simplify right side
    285,138x = 158,913,052,321
  5. Step 5: Solve for x
    x = 158,913,052,321/285,138
  6. Step 6: Final answer
    x = 557,319.80

Related Problems

Find third proportional to 142,569 and 199,319.50
Half scale
Find third proportional to 570,276 and 797,278
Double scale
Find third proportional to 285,140 and 398,642
Similar ratio
Find third proportional to 427,707 and 597,958.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.