Home / 79,878-128,688

Finding the Third Proportional to 79,878 and 128,688

Calculator

Solution

The third proportional to 79,878 and 128,688 is: 207,323.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,878 : 128,688 = 128,688 : x
  2. Step 2: Convert to fraction form
    79,878/128,688 = 128,688/x
  3. Step 3: Cross multiply
    79,878x = 128,688 × 128,688
  4. Step 4: Simplify right side
    79,878x = 16,560,601,344
  5. Step 5: Solve for x
    x = 16,560,601,344/79,878
  6. Step 6: Final answer
    x = 207,323.69

Related Problems

Find third proportional to 39,939 and 64,344
Half scale
Find third proportional to 159,756 and 257,376
Double scale
Find third proportional to 79,880 and 128,691
Similar ratio
Find third proportional to 119,817 and 193,032
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.